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Posted to commits@lucenenet.apache.org by ni...@apache.org on 2021/02/05 16:40:30 UTC

[lucenenet] branch master updated: Lucene.Net.Facet: Added Lucene version compatibility level to the top of each code file

This is an automated email from the ASF dual-hosted git repository.

nightowl888 pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/lucenenet.git


The following commit(s) were added to refs/heads/master by this push:
     new 0631f5c  Lucene.Net.Facet: Added Lucene version compatibility level to the top of each code file
0631f5c is described below

commit 0631f5c91eb752348e768e06a8e797f9bbd652c3
Author: Shad Storhaug <sh...@shadstorhaug.com>
AuthorDate: Fri Feb 5 18:34:41 2021 +0700

    Lucene.Net.Facet: Added Lucene version compatibility level to the top of each code file
---
 src/Lucene.Net.Facet/DrillDownQuery.cs             |  3 +-
 src/Lucene.Net.Facet/DrillSideways.cs              |  3 +-
 src/Lucene.Net.Facet/DrillSidewaysQuery.cs         |  3 +-
 src/Lucene.Net.Facet/DrillSidewaysScorer.cs        |  3 +-
 src/Lucene.Net.Facet/FacetField.cs                 |  3 +-
 src/Lucene.Net.Facet/FacetResult.cs                |  3 +-
 src/Lucene.Net.Facet/Facets.cs                     |  3 +-
 src/Lucene.Net.Facet/FacetsCollector.cs            |  3 +-
 src/Lucene.Net.Facet/FacetsConfig.cs               |  3 +-
 src/Lucene.Net.Facet/LabelAndValue.cs              |  3 +-
 src/Lucene.Net.Facet/MultiFacets.cs                |  3 +-
 .../RandomSamplingFacetsCollector.cs               |  3 +-
 src/Lucene.Net.Facet/Range/DoubleRange.cs          |  3 +-
 .../Range/DoubleRangeFacetCounts.cs                |  3 +-
 src/Lucene.Net.Facet/Range/LongRange.cs            |  3 +-
 src/Lucene.Net.Facet/Range/LongRangeCounter.cs     |  4 +--
 src/Lucene.Net.Facet/Range/LongRangeFacetCounts.cs |  3 +-
 src/Lucene.Net.Facet/Range/Range.cs                |  3 +-
 src/Lucene.Net.Facet/Range/RangeFacetCounts.cs     |  3 +-
 .../DefaultSortedSetDocValuesReaderState.cs        |  3 +-
 .../SortedSet/SortedSetDocValuesFacetCounts.cs     |  3 +-
 .../SortedSet/SortedSetDocValuesFacetField.cs      |  4 ++-
 .../SortedSet/SortedSetDocValuesReaderState.cs     |  3 +-
 .../Taxonomy/AssociationFacetField.cs              |  3 +-
 .../Taxonomy/CachedOrdinalsReader.cs               |  3 +-
 src/Lucene.Net.Facet/Taxonomy/CategoryPath.cs      |  3 +-
 src/Lucene.Net.Facet/Taxonomy/Directory/Consts.cs  |  4 ++-
 .../Taxonomy/Directory/DirectoryTaxonomyReader.cs  |  3 +-
 .../Taxonomy/Directory/DirectoryTaxonomyWriter.cs  |  5 ++-
 .../Taxonomy/Directory/TaxonomyIndexArrays.cs      |  3 +-
 .../Taxonomy/DocValuesOrdinalsReader.cs            |  4 ++-
 src/Lucene.Net.Facet/Taxonomy/FacetLabel.cs        |  3 +-
 .../Taxonomy/FastTaxonomyFacetCounts.cs            |  3 +-
 .../Taxonomy/FloatAssociationFacetField.cs         |  3 +-
 .../Taxonomy/FloatTaxonomyFacets.cs                |  3 +-
 .../Taxonomy/IntAssociationFacetField.cs           |  3 +-
 src/Lucene.Net.Facet/Taxonomy/IntTaxonomyFacets.cs |  3 +-
 src/Lucene.Net.Facet/Taxonomy/LRUHashMap.cs        |  3 +-
 src/Lucene.Net.Facet/Taxonomy/OrdinalsReader.cs    |  4 ++-
 .../Taxonomy/ParallelTaxonomyArrays.cs             |  3 +-
 .../Taxonomy/PrintTaxonomyStats.cs                 |  3 +-
 .../Taxonomy/SearcherTaxonomyManager.cs            |  3 +-
 .../Taxonomy/TaxonomyFacetCounts.cs                |  3 +-
 .../Taxonomy/TaxonomyFacetSumFloatAssociations.cs  |  3 +-
 .../Taxonomy/TaxonomyFacetSumIntAssociations.cs    |  3 +-
 .../Taxonomy/TaxonomyFacetSumValueSource.cs        |  3 +-
 src/Lucene.Net.Facet/Taxonomy/TaxonomyFacets.cs    |  3 +-
 src/Lucene.Net.Facet/Taxonomy/TaxonomyReader.cs    |  3 +-
 src/Lucene.Net.Facet/Taxonomy/TaxonomyWriter.cs    |  3 +-
 .../Taxonomy/WriterCache/CategoryPathUtils.cs      |  3 +-
 .../Taxonomy/WriterCache/CharBlockArray.cs         |  3 +-
 .../WriterCache/Cl2oTaxonomyWriterCache.cs         |  3 +-
 .../Taxonomy/WriterCache/CollisionMap.cs           |  3 +-
 .../Taxonomy/WriterCache/CompactLabelToOrdinal.cs  |  3 +-
 .../Taxonomy/WriterCache/LabelToOrdinal.cs         |  3 +-
 .../Taxonomy/WriterCache/LruTaxonomyWriterCache.cs |  3 +-
 .../Taxonomy/WriterCache/NameHashIntCacheLRU.cs    |  4 ++-
 .../Taxonomy/WriterCache/NameIntCacheLRU.cs        |  3 +-
 .../Taxonomy/WriterCache/TaxonomyWriterCache.cs    | 36 ++++++++++++----------
 src/Lucene.Net.Facet/TopOrdAndFloatQueue.cs        |  3 +-
 src/Lucene.Net.Facet/TopOrdAndIntQueue.cs          |  3 +-
 .../AssertingSubDocsAtOnceCollector.cs             |  3 +-
 src/Lucene.Net.Tests.Facet/FacetTestCase.cs        |  3 +-
 .../Range/TestRangeFacetCounts.cs                  |  3 +-
 src/Lucene.Net.Tests.Facet/SlowRAMDirectory.cs     |  3 +-
 .../SortedSet/TestSortedSetDocValuesFacets.cs      |  3 +-
 .../Taxonomy/Directory/TestAddTaxonomy.cs          |  3 +-
 .../Directory/TestConcurrentFacetedIndexing.cs     |  3 +-
 .../Directory/TestDirectoryTaxonomyReader.cs       |  3 +-
 .../Directory/TestDirectoryTaxonomyWriter.cs       |  3 +-
 .../Taxonomy/TestCachedOrdinalsReader.cs           |  3 +-
 .../Taxonomy/TestFacetLabel.cs                     |  3 +-
 .../Taxonomy/TestLRUHashMap.cs                     |  3 +-
 .../Taxonomy/TestSearcherTaxonomyManager.cs        |  3 +-
 .../Taxonomy/TestTaxonomyCombined.cs               |  3 +-
 .../Taxonomy/TestTaxonomyFacetAssociations.cs      |  3 +-
 .../Taxonomy/TestTaxonomyFacetCounts.cs            |  3 +-
 .../Taxonomy/TestTaxonomyFacetCounts2.cs           |  3 +-
 .../Taxonomy/TestTaxonomyFacetSumValueSource.cs    |  3 +-
 .../Taxonomy/WriterCache/TestCharBlockArray.cs     |  3 +-
 .../WriterCache/TestCompactLabelToOrdinal.cs       |  3 +-
 src/Lucene.Net.Tests.Facet/TestDrillDownQuery.cs   |  3 +-
 src/Lucene.Net.Tests.Facet/TestDrillSideways.cs    |  3 +-
 src/Lucene.Net.Tests.Facet/TestFacetsConfig.cs     |  3 +-
 .../TestMultipleIndexFields.cs                     |  3 +-
 .../TestRandomSamplingFacetsCollector.cs           |  3 +-
 86 files changed, 194 insertions(+), 105 deletions(-)

diff --git a/src/Lucene.Net.Facet/DrillDownQuery.cs b/src/Lucene.Net.Facet/DrillDownQuery.cs
index f7fca27..9754c7f 100644
--- a/src/Lucene.Net.Facet/DrillDownQuery.cs
+++ b/src/Lucene.Net.Facet/DrillDownQuery.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Diagnostics;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Diagnostics;
 using Lucene.Net.Support;
 using System;
 using System.Collections.Generic;
diff --git a/src/Lucene.Net.Facet/DrillSideways.cs b/src/Lucene.Net.Facet/DrillSideways.cs
index 80d0509..9a8b9f5 100644
--- a/src/Lucene.Net.Facet/DrillSideways.cs
+++ b/src/Lucene.Net.Facet/DrillSideways.cs
@@ -1,4 +1,5 @@
-using J2N.Collections.Generic.Extensions;
+// Lucene version compatibility level 4.8.1
+using J2N.Collections.Generic.Extensions;
 using Lucene.Net.Diagnostics;
 using Lucene.Net.Facet.SortedSet;
 using Lucene.Net.Facet.Taxonomy;
diff --git a/src/Lucene.Net.Facet/DrillSidewaysQuery.cs b/src/Lucene.Net.Facet/DrillSidewaysQuery.cs
index bab7ed3..5bb8c70 100644
--- a/src/Lucene.Net.Facet/DrillSidewaysQuery.cs
+++ b/src/Lucene.Net.Facet/DrillSidewaysQuery.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Support;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Support;
 using System;
 
 namespace Lucene.Net.Facet
diff --git a/src/Lucene.Net.Facet/DrillSidewaysScorer.cs b/src/Lucene.Net.Facet/DrillSidewaysScorer.cs
index ff8dd1f..53694bb 100644
--- a/src/Lucene.Net.Facet/DrillSidewaysScorer.cs
+++ b/src/Lucene.Net.Facet/DrillSidewaysScorer.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Diagnostics;
+// Lucene version compatibility level 4.8.1 + LUCENE-6001
+using Lucene.Net.Diagnostics;
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
diff --git a/src/Lucene.Net.Facet/FacetField.cs b/src/Lucene.Net.Facet/FacetField.cs
index 20bf4cc..a34f34d 100644
--- a/src/Lucene.Net.Facet/FacetField.cs
+++ b/src/Lucene.Net.Facet/FacetField.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Support;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Support;
 using System;
 using System.Diagnostics.CodeAnalysis;
 
diff --git a/src/Lucene.Net.Facet/FacetResult.cs b/src/Lucene.Net.Facet/FacetResult.cs
index f5911f8..c5c0d8e 100644
--- a/src/Lucene.Net.Facet/FacetResult.cs
+++ b/src/Lucene.Net.Facet/FacetResult.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Support;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Support;
 using System;
 using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
diff --git a/src/Lucene.Net.Facet/Facets.cs b/src/Lucene.Net.Facet/Facets.cs
index 50b5263..64df1ae 100644
--- a/src/Lucene.Net.Facet/Facets.cs
+++ b/src/Lucene.Net.Facet/Facets.cs
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+// Lucene version compatibility level 4.8.1
+using System.Collections.Generic;
 
 namespace Lucene.Net.Facet
 {
diff --git a/src/Lucene.Net.Facet/FacetsCollector.cs b/src/Lucene.Net.Facet/FacetsCollector.cs
index ab07ebe..41cc262 100644
--- a/src/Lucene.Net.Facet/FacetsCollector.cs
+++ b/src/Lucene.Net.Facet/FacetsCollector.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Index;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Index;
 using Lucene.Net.Search;
 using Lucene.Net.Support;
 using Lucene.Net.Util;
diff --git a/src/Lucene.Net.Facet/FacetsConfig.cs b/src/Lucene.Net.Facet/FacetsConfig.cs
index 8a430d0..735157e 100644
--- a/src/Lucene.Net.Facet/FacetsConfig.cs
+++ b/src/Lucene.Net.Facet/FacetsConfig.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Diagnostics;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Diagnostics;
 using Lucene.Net.Support;
 using System;
 using System.Collections.Concurrent;
diff --git a/src/Lucene.Net.Facet/LabelAndValue.cs b/src/Lucene.Net.Facet/LabelAndValue.cs
index 8c7eb4c..a839540 100644
--- a/src/Lucene.Net.Facet/LabelAndValue.cs
+++ b/src/Lucene.Net.Facet/LabelAndValue.cs
@@ -1,4 +1,5 @@
-using System;
+// Lucene version compatibility level 4.8.1
+using System;
 using System.Globalization;
 
 namespace Lucene.Net.Facet
diff --git a/src/Lucene.Net.Facet/MultiFacets.cs b/src/Lucene.Net.Facet/MultiFacets.cs
index cb4e57d..fe86597 100644
--- a/src/Lucene.Net.Facet/MultiFacets.cs
+++ b/src/Lucene.Net.Facet/MultiFacets.cs
@@ -1,4 +1,5 @@
-using System;
+// Lucene version compatibility level 4.8.1
+using System;
 using System.Collections.Generic;
 
 namespace Lucene.Net.Facet
diff --git a/src/Lucene.Net.Facet/RandomSamplingFacetsCollector.cs b/src/Lucene.Net.Facet/RandomSamplingFacetsCollector.cs
index 0c80dab..418c83e 100644
--- a/src/Lucene.Net.Facet/RandomSamplingFacetsCollector.cs
+++ b/src/Lucene.Net.Facet/RandomSamplingFacetsCollector.cs
@@ -1,4 +1,5 @@
-using System;
+// Lucene version compatibility level 4.8.1
+using System;
 using System.Collections.Generic;
 using System.IO;
 
diff --git a/src/Lucene.Net.Facet/Range/DoubleRange.cs b/src/Lucene.Net.Facet/Range/DoubleRange.cs
index 767aed1..eb2e8a1 100644
--- a/src/Lucene.Net.Facet/Range/DoubleRange.cs
+++ b/src/Lucene.Net.Facet/Range/DoubleRange.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Search;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Search;
 using Lucene.Net.Support;
 using System;
 
diff --git a/src/Lucene.Net.Facet/Range/DoubleRangeFacetCounts.cs b/src/Lucene.Net.Facet/Range/DoubleRangeFacetCounts.cs
index fe95867..4a5f18f 100644
--- a/src/Lucene.Net.Facet/Range/DoubleRangeFacetCounts.cs
+++ b/src/Lucene.Net.Facet/Range/DoubleRangeFacetCounts.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Support;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Support;
 using System;
 using System.Collections.Generic;
 
diff --git a/src/Lucene.Net.Facet/Range/LongRange.cs b/src/Lucene.Net.Facet/Range/LongRange.cs
index 3ed9d02..0f3bfe8 100644
--- a/src/Lucene.Net.Facet/Range/LongRange.cs
+++ b/src/Lucene.Net.Facet/Range/LongRange.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Support;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Support;
 using System;
 
 namespace Lucene.Net.Facet.Range
diff --git a/src/Lucene.Net.Facet/Range/LongRangeCounter.cs b/src/Lucene.Net.Facet/Range/LongRangeCounter.cs
index 7fa886c..63a40a7 100644
--- a/src/Lucene.Net.Facet/Range/LongRangeCounter.cs
+++ b/src/Lucene.Net.Facet/Range/LongRangeCounter.cs
@@ -1,6 +1,6 @@
-using Lucene.Net.Diagnostics;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Diagnostics;
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.Text;
 
 namespace Lucene.Net.Facet.Range
diff --git a/src/Lucene.Net.Facet/Range/LongRangeFacetCounts.cs b/src/Lucene.Net.Facet/Range/LongRangeFacetCounts.cs
index 8afbe15..485f1c6 100644
--- a/src/Lucene.Net.Facet/Range/LongRangeFacetCounts.cs
+++ b/src/Lucene.Net.Facet/Range/LongRangeFacetCounts.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Support;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Support;
 using System;
 using System.Collections.Generic;
 
diff --git a/src/Lucene.Net.Facet/Range/Range.cs b/src/Lucene.Net.Facet/Range/Range.cs
index db620be..745d7fe 100644
--- a/src/Lucene.Net.Facet/Range/Range.cs
+++ b/src/Lucene.Net.Facet/Range/Range.cs
@@ -1,4 +1,5 @@
-using System;
+// Lucene version compatibility level 4.8.1
+using System;
 
 namespace Lucene.Net.Facet.Range
 {
diff --git a/src/Lucene.Net.Facet/Range/RangeFacetCounts.cs b/src/Lucene.Net.Facet/Range/RangeFacetCounts.cs
index 0e84cee..bd44fa8 100644
--- a/src/Lucene.Net.Facet/Range/RangeFacetCounts.cs
+++ b/src/Lucene.Net.Facet/Range/RangeFacetCounts.cs
@@ -1,4 +1,5 @@
-using System;
+// Lucene version compatibility level 4.8.1
+using System;
 using System.Collections.Generic;
 
 namespace Lucene.Net.Facet.Range
diff --git a/src/Lucene.Net.Facet/SortedSet/DefaultSortedSetDocValuesReaderState.cs b/src/Lucene.Net.Facet/SortedSet/DefaultSortedSetDocValuesReaderState.cs
index 235d2ee..3d7c3cc 100644
--- a/src/Lucene.Net.Facet/SortedSet/DefaultSortedSetDocValuesReaderState.cs
+++ b/src/Lucene.Net.Facet/SortedSet/DefaultSortedSetDocValuesReaderState.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Index;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Index;
 using Lucene.Net.Support;
 using Lucene.Net.Util;
 using System;
diff --git a/src/Lucene.Net.Facet/SortedSet/SortedSetDocValuesFacetCounts.cs b/src/Lucene.Net.Facet/SortedSet/SortedSetDocValuesFacetCounts.cs
index 0ee82f2..14ae716 100644
--- a/src/Lucene.Net.Facet/SortedSet/SortedSetDocValuesFacetCounts.cs
+++ b/src/Lucene.Net.Facet/SortedSet/SortedSetDocValuesFacetCounts.cs
@@ -1,4 +1,5 @@
-using J2N.Text;
+// Lucene version compatibility level 4.8.1
+using J2N.Text;
 using Lucene.Net.Support;
 using System;
 using System.Collections.Generic;
diff --git a/src/Lucene.Net.Facet/SortedSet/SortedSetDocValuesFacetField.cs b/src/Lucene.Net.Facet/SortedSet/SortedSetDocValuesFacetField.cs
index 6d387ac..c5c0e40 100644
--- a/src/Lucene.Net.Facet/SortedSet/SortedSetDocValuesFacetField.cs
+++ b/src/Lucene.Net.Facet/SortedSet/SortedSetDocValuesFacetField.cs
@@ -1,4 +1,6 @@
-namespace Lucene.Net.Facet.SortedSet
+// Lucene version compatibility level 4.8.1
+
+namespace Lucene.Net.Facet.SortedSet
 {
     /*
      * Licensed to the Apache Software Foundation (ASF) under one or more
diff --git a/src/Lucene.Net.Facet/SortedSet/SortedSetDocValuesReaderState.cs b/src/Lucene.Net.Facet/SortedSet/SortedSetDocValuesReaderState.cs
index 4442924..4eb7bcc 100644
--- a/src/Lucene.Net.Facet/SortedSet/SortedSetDocValuesReaderState.cs
+++ b/src/Lucene.Net.Facet/SortedSet/SortedSetDocValuesReaderState.cs
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+// Lucene version compatibility level 4.8.1
+using System.Collections.Generic;
 
 namespace Lucene.Net.Facet.SortedSet
 {
diff --git a/src/Lucene.Net.Facet/Taxonomy/AssociationFacetField.cs b/src/Lucene.Net.Facet/Taxonomy/AssociationFacetField.cs
index 9723efd..d277361 100644
--- a/src/Lucene.Net.Facet/Taxonomy/AssociationFacetField.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/AssociationFacetField.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Support;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Support;
 using System;
 using System.Diagnostics.CodeAnalysis;
 
diff --git a/src/Lucene.Net.Facet/Taxonomy/CachedOrdinalsReader.cs b/src/Lucene.Net.Facet/Taxonomy/CachedOrdinalsReader.cs
index 6055162..7ffe9b5 100644
--- a/src/Lucene.Net.Facet/Taxonomy/CachedOrdinalsReader.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/CachedOrdinalsReader.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Support;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Support;
 using System;
 using System.Diagnostics.CodeAnalysis;
 using System.Runtime.CompilerServices;
diff --git a/src/Lucene.Net.Facet/Taxonomy/CategoryPath.cs b/src/Lucene.Net.Facet/Taxonomy/CategoryPath.cs
index 64d2f55..46c4309 100644
--- a/src/Lucene.Net.Facet/Taxonomy/CategoryPath.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/CategoryPath.cs
@@ -1,4 +1,5 @@
-using J2N.Text;
+// Lucene version compatibility level 4.8.1
+using J2N.Text;
 using Lucene.Net.Diagnostics;
 using Lucene.Net.Support;
 using System;
diff --git a/src/Lucene.Net.Facet/Taxonomy/Directory/Consts.cs b/src/Lucene.Net.Facet/Taxonomy/Directory/Consts.cs
index 3660ff0..39c991f 100644
--- a/src/Lucene.Net.Facet/Taxonomy/Directory/Consts.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/Directory/Consts.cs
@@ -1,4 +1,6 @@
-namespace Lucene.Net.Facet.Taxonomy.Directory
+// Lucene version compatibility level 4.8.1
+
+namespace Lucene.Net.Facet.Taxonomy.Directory
 {
     /*
      * Licensed to the Apache Software Foundation (ASF) under one or more
diff --git a/src/Lucene.Net.Facet/Taxonomy/Directory/DirectoryTaxonomyReader.cs b/src/Lucene.Net.Facet/Taxonomy/Directory/DirectoryTaxonomyReader.cs
index 2986afa..0de5a71 100644
--- a/src/Lucene.Net.Facet/Taxonomy/Directory/DirectoryTaxonomyReader.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/Directory/DirectoryTaxonomyReader.cs
@@ -1,4 +1,5 @@
-using System;
+// Lucene version compatibility level 4.8.1
+using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Text;
diff --git a/src/Lucene.Net.Facet/Taxonomy/Directory/DirectoryTaxonomyWriter.cs b/src/Lucene.Net.Facet/Taxonomy/Directory/DirectoryTaxonomyWriter.cs
index 25fd4b8..c45a3f5 100644
--- a/src/Lucene.Net.Facet/Taxonomy/Directory/DirectoryTaxonomyWriter.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/Directory/DirectoryTaxonomyWriter.cs
@@ -1,4 +1,5 @@
-using J2N.Threading.Atomic;
+// Lucene version compatibility level 4.8.1
+using J2N.Threading.Atomic;
 using Lucene.Net.Analysis.TokenAttributes;
 using Lucene.Net.Diagnostics;
 using Lucene.Net.Index;
@@ -8,9 +9,7 @@ using Lucene.Net.Support;
 using Lucene.Net.Util;
 using System;
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.IO;
-using System.Threading;
 
 namespace Lucene.Net.Facet.Taxonomy.Directory
 {
diff --git a/src/Lucene.Net.Facet/Taxonomy/Directory/TaxonomyIndexArrays.cs b/src/Lucene.Net.Facet/Taxonomy/Directory/TaxonomyIndexArrays.cs
index dd5030e..7c4e716 100644
--- a/src/Lucene.Net.Facet/Taxonomy/Directory/TaxonomyIndexArrays.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/Directory/TaxonomyIndexArrays.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Diagnostics;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Diagnostics;
 using Lucene.Net.Index;
 using Lucene.Net.Support;
 using System;
diff --git a/src/Lucene.Net.Facet/Taxonomy/DocValuesOrdinalsReader.cs b/src/Lucene.Net.Facet/Taxonomy/DocValuesOrdinalsReader.cs
index 46ab317..7621924 100644
--- a/src/Lucene.Net.Facet/Taxonomy/DocValuesOrdinalsReader.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/DocValuesOrdinalsReader.cs
@@ -1,4 +1,6 @@
-namespace Lucene.Net.Facet.Taxonomy
+// Lucene version compatibility level 4.8.1
+
+namespace Lucene.Net.Facet.Taxonomy
 {
     /*
      * Licensed to the Apache Software Foundation (ASF) under one or more
diff --git a/src/Lucene.Net.Facet/Taxonomy/FacetLabel.cs b/src/Lucene.Net.Facet/Taxonomy/FacetLabel.cs
index 9f6b20f..0d6343f 100644
--- a/src/Lucene.Net.Facet/Taxonomy/FacetLabel.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/FacetLabel.cs
@@ -1,4 +1,5 @@
-using J2N.Text;
+// Lucene version compatibility level 4.8.1
+using J2N.Text;
 using Lucene.Net.Diagnostics;
 using Lucene.Net.Support;
 using System;
diff --git a/src/Lucene.Net.Facet/Taxonomy/FastTaxonomyFacetCounts.cs b/src/Lucene.Net.Facet/Taxonomy/FastTaxonomyFacetCounts.cs
index e16e53a..7c36937 100644
--- a/src/Lucene.Net.Facet/Taxonomy/FastTaxonomyFacetCounts.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/FastTaxonomyFacetCounts.cs
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+// Lucene version compatibility level 4.8.1
+using System.Collections.Generic;
 
 namespace Lucene.Net.Facet.Taxonomy
 {
diff --git a/src/Lucene.Net.Facet/Taxonomy/FloatAssociationFacetField.cs b/src/Lucene.Net.Facet/Taxonomy/FloatAssociationFacetField.cs
index 374f8a6..93eb176 100644
--- a/src/Lucene.Net.Facet/Taxonomy/FloatAssociationFacetField.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/FloatAssociationFacetField.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Support;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Support;
 using System.Globalization;
 
 namespace Lucene.Net.Facet.Taxonomy
diff --git a/src/Lucene.Net.Facet/Taxonomy/FloatTaxonomyFacets.cs b/src/Lucene.Net.Facet/Taxonomy/FloatTaxonomyFacets.cs
index 15e8233..cbe9fe1 100644
--- a/src/Lucene.Net.Facet/Taxonomy/FloatTaxonomyFacets.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/FloatTaxonomyFacets.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Diagnostics;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Diagnostics;
 using System;
 using System.Collections.Generic;
 using System.Diagnostics;
diff --git a/src/Lucene.Net.Facet/Taxonomy/IntAssociationFacetField.cs b/src/Lucene.Net.Facet/Taxonomy/IntAssociationFacetField.cs
index 9e13e03..31cea93 100644
--- a/src/Lucene.Net.Facet/Taxonomy/IntAssociationFacetField.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/IntAssociationFacetField.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Support;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Support;
 
 namespace Lucene.Net.Facet.Taxonomy
 {
diff --git a/src/Lucene.Net.Facet/Taxonomy/IntTaxonomyFacets.cs b/src/Lucene.Net.Facet/Taxonomy/IntTaxonomyFacets.cs
index 409dde9..a801681 100644
--- a/src/Lucene.Net.Facet/Taxonomy/IntTaxonomyFacets.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/IntTaxonomyFacets.cs
@@ -1,4 +1,5 @@
-using System;
+// Lucene version compatibility level 4.8.1
+using System;
 using System.Collections.Generic;
 
 namespace Lucene.Net.Facet.Taxonomy
diff --git a/src/Lucene.Net.Facet/Taxonomy/LRUHashMap.cs b/src/Lucene.Net.Facet/Taxonomy/LRUHashMap.cs
index d1e3e59..cdc7230 100644
--- a/src/Lucene.Net.Facet/Taxonomy/LRUHashMap.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/LRUHashMap.cs
@@ -1,4 +1,5 @@
-using J2N.Collections.Concurrent;
+// Lucene version compatibility level 4.8.1
+using J2N.Collections.Concurrent;
 using System;
 using System.Collections;
 using System.Collections.Generic;
diff --git a/src/Lucene.Net.Facet/Taxonomy/OrdinalsReader.cs b/src/Lucene.Net.Facet/Taxonomy/OrdinalsReader.cs
index b390813..c73a770 100644
--- a/src/Lucene.Net.Facet/Taxonomy/OrdinalsReader.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/OrdinalsReader.cs
@@ -1,4 +1,6 @@
-namespace Lucene.Net.Facet.Taxonomy
+// Lucene version compatibility level 4.8.1
+
+namespace Lucene.Net.Facet.Taxonomy
 {
     /*
      * Licensed to the Apache Software Foundation (ASF) under one or more
diff --git a/src/Lucene.Net.Facet/Taxonomy/ParallelTaxonomyArrays.cs b/src/Lucene.Net.Facet/Taxonomy/ParallelTaxonomyArrays.cs
index 64b8dc9..d4dbd3f 100644
--- a/src/Lucene.Net.Facet/Taxonomy/ParallelTaxonomyArrays.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/ParallelTaxonomyArrays.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Support;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Support;
 using System.Diagnostics.CodeAnalysis;
 
 namespace Lucene.Net.Facet.Taxonomy
diff --git a/src/Lucene.Net.Facet/Taxonomy/PrintTaxonomyStats.cs b/src/Lucene.Net.Facet/Taxonomy/PrintTaxonomyStats.cs
index 44394a8..1b60962 100644
--- a/src/Lucene.Net.Facet/Taxonomy/PrintTaxonomyStats.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/PrintTaxonomyStats.cs
@@ -1,4 +1,5 @@
-using System;
+// Lucene version compatibility level 4.8.1
+using System;
 using System.IO;
 
 namespace Lucene.Net.Facet.Taxonomy
diff --git a/src/Lucene.Net.Facet/Taxonomy/SearcherTaxonomyManager.cs b/src/Lucene.Net.Facet/Taxonomy/SearcherTaxonomyManager.cs
index 1427f15..8a5f82d 100644
--- a/src/Lucene.Net.Facet/Taxonomy/SearcherTaxonomyManager.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/SearcherTaxonomyManager.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Search;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Search;
 using System;
 
 namespace Lucene.Net.Facet.Taxonomy
diff --git a/src/Lucene.Net.Facet/Taxonomy/TaxonomyFacetCounts.cs b/src/Lucene.Net.Facet/Taxonomy/TaxonomyFacetCounts.cs
index 0014366..bc8f9f0 100644
--- a/src/Lucene.Net.Facet/Taxonomy/TaxonomyFacetCounts.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/TaxonomyFacetCounts.cs
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+// Lucene version compatibility level 4.8.1
+using System.Collections.Generic;
 
 namespace Lucene.Net.Facet.Taxonomy
 {
diff --git a/src/Lucene.Net.Facet/Taxonomy/TaxonomyFacetSumFloatAssociations.cs b/src/Lucene.Net.Facet/Taxonomy/TaxonomyFacetSumFloatAssociations.cs
index 72d35ac..06733fc 100644
--- a/src/Lucene.Net.Facet/Taxonomy/TaxonomyFacetSumFloatAssociations.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/TaxonomyFacetSumFloatAssociations.cs
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+// Lucene version compatibility level 4.8.1
+using System.Collections.Generic;
 
 namespace Lucene.Net.Facet.Taxonomy
 {
diff --git a/src/Lucene.Net.Facet/Taxonomy/TaxonomyFacetSumIntAssociations.cs b/src/Lucene.Net.Facet/Taxonomy/TaxonomyFacetSumIntAssociations.cs
index cb4d17f..b30370f 100644
--- a/src/Lucene.Net.Facet/Taxonomy/TaxonomyFacetSumIntAssociations.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/TaxonomyFacetSumIntAssociations.cs
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+// Lucene version compatibility level 4.8.1
+using System.Collections.Generic;
 
 namespace Lucene.Net.Facet.Taxonomy
 {
diff --git a/src/Lucene.Net.Facet/Taxonomy/TaxonomyFacetSumValueSource.cs b/src/Lucene.Net.Facet/Taxonomy/TaxonomyFacetSumValueSource.cs
index 3d8c6b0..218bf20 100644
--- a/src/Lucene.Net.Facet/Taxonomy/TaxonomyFacetSumValueSource.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/TaxonomyFacetSumValueSource.cs
@@ -1,4 +1,5 @@
-using System;
+// Lucene version compatibility level 4.8.1
+using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.IO;
diff --git a/src/Lucene.Net.Facet/Taxonomy/TaxonomyFacets.cs b/src/Lucene.Net.Facet/Taxonomy/TaxonomyFacets.cs
index c0ae7b2..1205c65 100644
--- a/src/Lucene.Net.Facet/Taxonomy/TaxonomyFacets.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/TaxonomyFacets.cs
@@ -1,4 +1,5 @@
-using J2N.Text;
+// Lucene version compatibility level 4.8.1
+using J2N.Text;
 using System;
 using System.Collections.Generic;
 
diff --git a/src/Lucene.Net.Facet/Taxonomy/TaxonomyReader.cs b/src/Lucene.Net.Facet/Taxonomy/TaxonomyReader.cs
index d3aee8f..3a82084 100644
--- a/src/Lucene.Net.Facet/Taxonomy/TaxonomyReader.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/TaxonomyReader.cs
@@ -1,4 +1,5 @@
-using J2N.Threading.Atomic;
+// Lucene version compatibility level 4.8.1
+using J2N.Threading.Atomic;
 using Lucene.Net.Diagnostics;
 using System;
 using System.Collections.Generic;
diff --git a/src/Lucene.Net.Facet/Taxonomy/TaxonomyWriter.cs b/src/Lucene.Net.Facet/Taxonomy/TaxonomyWriter.cs
index e4edd4c..89d41fd 100644
--- a/src/Lucene.Net.Facet/Taxonomy/TaxonomyWriter.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/TaxonomyWriter.cs
@@ -1,4 +1,5 @@
-using System;
+// Lucene version compatibility level 4.8.1
+using System;
 using System.Collections.Generic;
 
 namespace Lucene.Net.Facet.Taxonomy
diff --git a/src/Lucene.Net.Facet/Taxonomy/WriterCache/CategoryPathUtils.cs b/src/Lucene.Net.Facet/Taxonomy/WriterCache/CategoryPathUtils.cs
index 4a2a00f..8dd51fd 100644
--- a/src/Lucene.Net.Facet/Taxonomy/WriterCache/CategoryPathUtils.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/WriterCache/CategoryPathUtils.cs
@@ -1,4 +1,5 @@
-using System;
+// Lucene version compatibility level 4.8.1
+using System;
 
 namespace Lucene.Net.Facet.Taxonomy.WriterCache
 {
diff --git a/src/Lucene.Net.Facet/Taxonomy/WriterCache/CharBlockArray.cs b/src/Lucene.Net.Facet/Taxonomy/WriterCache/CharBlockArray.cs
index c8412b6..a4db7e9 100644
--- a/src/Lucene.Net.Facet/Taxonomy/WriterCache/CharBlockArray.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/WriterCache/CharBlockArray.cs
@@ -1,4 +1,5 @@
-using J2N.Text;
+// Lucene version compatibility level 4.8.1
+using J2N.Text;
 using Lucene.Net.Support.IO;
 using System;
 using System.Collections.Generic;
diff --git a/src/Lucene.Net.Facet/Taxonomy/WriterCache/Cl2oTaxonomyWriterCache.cs b/src/Lucene.Net.Facet/Taxonomy/WriterCache/Cl2oTaxonomyWriterCache.cs
index e505ea0..3699a45 100644
--- a/src/Lucene.Net.Facet/Taxonomy/WriterCache/Cl2oTaxonomyWriterCache.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/WriterCache/Cl2oTaxonomyWriterCache.cs
@@ -1,4 +1,5 @@
-using System;
+// Lucene version compatibility level 4.8.1
+using System;
 using System.Threading;
 
 namespace Lucene.Net.Facet.Taxonomy.WriterCache
diff --git a/src/Lucene.Net.Facet/Taxonomy/WriterCache/CollisionMap.cs b/src/Lucene.Net.Facet/Taxonomy/WriterCache/CollisionMap.cs
index 9ebc1c9..d4cf618 100644
--- a/src/Lucene.Net.Facet/Taxonomy/WriterCache/CollisionMap.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/WriterCache/CollisionMap.cs
@@ -1,4 +1,5 @@
-using System;
+// Lucene version compatibility level 4.8.1
+using System;
 using System.Collections;
 using System.Collections.Generic;
 
diff --git a/src/Lucene.Net.Facet/Taxonomy/WriterCache/CompactLabelToOrdinal.cs b/src/Lucene.Net.Facet/Taxonomy/WriterCache/CompactLabelToOrdinal.cs
index 824b42d..685c86d 100644
--- a/src/Lucene.Net.Facet/Taxonomy/WriterCache/CompactLabelToOrdinal.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/WriterCache/CompactLabelToOrdinal.cs
@@ -1,4 +1,5 @@
-using System;
+// Lucene version compatibility level 4.8.1
+using System;
 using System.IO;
 using System.Runtime.Serialization;
 
diff --git a/src/Lucene.Net.Facet/Taxonomy/WriterCache/LabelToOrdinal.cs b/src/Lucene.Net.Facet/Taxonomy/WriterCache/LabelToOrdinal.cs
index ca522a7..20529c6 100644
--- a/src/Lucene.Net.Facet/Taxonomy/WriterCache/LabelToOrdinal.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/WriterCache/LabelToOrdinal.cs
@@ -1,4 +1,5 @@
-using System;
+// Lucene version compatibility level 4.8.1
+using System;
 
 namespace Lucene.Net.Facet.Taxonomy.WriterCache
 {
diff --git a/src/Lucene.Net.Facet/Taxonomy/WriterCache/LruTaxonomyWriterCache.cs b/src/Lucene.Net.Facet/Taxonomy/WriterCache/LruTaxonomyWriterCache.cs
index e187a80..484fc3a 100644
--- a/src/Lucene.Net.Facet/Taxonomy/WriterCache/LruTaxonomyWriterCache.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/WriterCache/LruTaxonomyWriterCache.cs
@@ -1,4 +1,5 @@
-using System;
+// Lucene version compatibility level 4.8.1
+using System;
 
 namespace Lucene.Net.Facet.Taxonomy.WriterCache
 {
diff --git a/src/Lucene.Net.Facet/Taxonomy/WriterCache/NameHashIntCacheLRU.cs b/src/Lucene.Net.Facet/Taxonomy/WriterCache/NameHashIntCacheLRU.cs
index bdfb4d9..e54b721 100644
--- a/src/Lucene.Net.Facet/Taxonomy/WriterCache/NameHashIntCacheLRU.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/WriterCache/NameHashIntCacheLRU.cs
@@ -1,4 +1,6 @@
-namespace Lucene.Net.Facet.Taxonomy.WriterCache
+// Lucene version compatibility level 4.8.1
+
+namespace Lucene.Net.Facet.Taxonomy.WriterCache
 {
     /*
      * Licensed to the Apache Software Foundation (ASF) under one or more
diff --git a/src/Lucene.Net.Facet/Taxonomy/WriterCache/NameIntCacheLRU.cs b/src/Lucene.Net.Facet/Taxonomy/WriterCache/NameIntCacheLRU.cs
index 25beaf6..f927262 100644
--- a/src/Lucene.Net.Facet/Taxonomy/WriterCache/NameIntCacheLRU.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/WriterCache/NameIntCacheLRU.cs
@@ -1,4 +1,5 @@
-using J2N.Collections.Concurrent;
+// Lucene version compatibility level 4.8.1
+using J2N.Collections.Concurrent;
 using System;
 using System.Collections.Concurrent;
 using System.Collections.Generic;
diff --git a/src/Lucene.Net.Facet/Taxonomy/WriterCache/TaxonomyWriterCache.cs b/src/Lucene.Net.Facet/Taxonomy/WriterCache/TaxonomyWriterCache.cs
index 1f7e712..093c11d 100644
--- a/src/Lucene.Net.Facet/Taxonomy/WriterCache/TaxonomyWriterCache.cs
+++ b/src/Lucene.Net.Facet/Taxonomy/WriterCache/TaxonomyWriterCache.cs
@@ -1,22 +1,24 @@
-namespace Lucene.Net.Facet.Taxonomy.WriterCache
+// Lucene version compatibility level 4.8.1
+using System;
+
+namespace Lucene.Net.Facet.Taxonomy.WriterCache
 {
-    using System;
     /*
-* Licensed to the Apache Software Foundation (ASF) under one or more
-* contributor license agreements.  See the NOTICE file distributed with
-* this work for additional information regarding copyright ownership.
-* The ASF licenses this file to You under the Apache License, Version 2.0
-* (the "License"); you may not use this file except in compliance with
-* the License.  You may obtain a copy of the License at
-*
-*     http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*/
+     * Licensed to the Apache Software Foundation (ASF) under one or more
+     * contributor license agreements.  See the NOTICE file distributed with
+     * this work for additional information regarding copyright ownership.
+     * The ASF licenses this file to You under the Apache License, Version 2.0
+     * (the "License"); you may not use this file except in compliance with
+     * the License.  You may obtain a copy of the License at
+     *
+     *     http://www.apache.org/licenses/LICENSE-2.0
+     *
+     * Unless required by applicable law or agreed to in writing, software
+     * distributed under the License is distributed on an "AS IS" BASIS,
+     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+     * See the License for the specific language governing permissions and
+     * limitations under the License.
+     */
 
     using DirectoryTaxonomyWriter = Lucene.Net.Facet.Taxonomy.Directory.DirectoryTaxonomyWriter;
 
diff --git a/src/Lucene.Net.Facet/TopOrdAndFloatQueue.cs b/src/Lucene.Net.Facet/TopOrdAndFloatQueue.cs
index 8761aa9..61c35a3 100644
--- a/src/Lucene.Net.Facet/TopOrdAndFloatQueue.cs
+++ b/src/Lucene.Net.Facet/TopOrdAndFloatQueue.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Util;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Util;
 using System;
 using System.Runtime.InteropServices;
 
diff --git a/src/Lucene.Net.Facet/TopOrdAndIntQueue.cs b/src/Lucene.Net.Facet/TopOrdAndIntQueue.cs
index e95ad97..f63040c 100644
--- a/src/Lucene.Net.Facet/TopOrdAndIntQueue.cs
+++ b/src/Lucene.Net.Facet/TopOrdAndIntQueue.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Util;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Util;
 
 namespace Lucene.Net.Facet
 {
diff --git a/src/Lucene.Net.Tests.Facet/AssertingSubDocsAtOnceCollector.cs b/src/Lucene.Net.Tests.Facet/AssertingSubDocsAtOnceCollector.cs
index 2ae8c03..a8c1e3d 100644
--- a/src/Lucene.Net.Tests.Facet/AssertingSubDocsAtOnceCollector.cs
+++ b/src/Lucene.Net.Tests.Facet/AssertingSubDocsAtOnceCollector.cs
@@ -1,4 +1,5 @@
-using System;
+// Lucene version compatibility level 4.8.1
+using System;
 using System.Collections.Generic;
 
 namespace Lucene.Net.Facet
diff --git a/src/Lucene.Net.Tests.Facet/FacetTestCase.cs b/src/Lucene.Net.Tests.Facet/FacetTestCase.cs
index 2c2cccd..6befeff 100644
--- a/src/Lucene.Net.Tests.Facet/FacetTestCase.cs
+++ b/src/Lucene.Net.Tests.Facet/FacetTestCase.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Diagnostics;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Diagnostics;
 using Lucene.Net.Support;
 using NUnit.Framework;
 using System;
diff --git a/src/Lucene.Net.Tests.Facet/Range/TestRangeFacetCounts.cs b/src/Lucene.Net.Tests.Facet/Range/TestRangeFacetCounts.cs
index 627e156..cd742c5 100644
--- a/src/Lucene.Net.Tests.Facet/Range/TestRangeFacetCounts.cs
+++ b/src/Lucene.Net.Tests.Facet/Range/TestRangeFacetCounts.cs
@@ -1,4 +1,5 @@
-using J2N.Threading.Atomic;
+// Lucene version compatibility level 4.8.1
+using J2N.Threading.Atomic;
 using Lucene.Net.Diagnostics;
 using Lucene.Net.Search;
 using NUnit.Framework;
diff --git a/src/Lucene.Net.Tests.Facet/SlowRAMDirectory.cs b/src/Lucene.Net.Tests.Facet/SlowRAMDirectory.cs
index 7efe8b9..6dc1b89 100644
--- a/src/Lucene.Net.Tests.Facet/SlowRAMDirectory.cs
+++ b/src/Lucene.Net.Tests.Facet/SlowRAMDirectory.cs
@@ -1,4 +1,5 @@
-using System;
+// Lucene version compatibility level 4.8.1
+using System;
 using System.Threading;
 
 namespace Lucene.Net.Facet
diff --git a/src/Lucene.Net.Tests.Facet/SortedSet/TestSortedSetDocValuesFacets.cs b/src/Lucene.Net.Tests.Facet/SortedSet/TestSortedSetDocValuesFacets.cs
index 1d4f5b3..69fb35a 100644
--- a/src/Lucene.Net.Tests.Facet/SortedSet/TestSortedSetDocValuesFacets.cs
+++ b/src/Lucene.Net.Tests.Facet/SortedSet/TestSortedSetDocValuesFacets.cs
@@ -1,4 +1,5 @@
-using NUnit.Framework;
+// Lucene version compatibility level 4.8.1
+using NUnit.Framework;
 using System;
 using System.Collections.Generic;
 using Assert = Lucene.Net.TestFramework.Assert;
diff --git a/src/Lucene.Net.Tests.Facet/Taxonomy/Directory/TestAddTaxonomy.cs b/src/Lucene.Net.Tests.Facet/Taxonomy/Directory/TestAddTaxonomy.cs
index 793d2ed..b778272 100644
--- a/src/Lucene.Net.Tests.Facet/Taxonomy/Directory/TestAddTaxonomy.cs
+++ b/src/Lucene.Net.Tests.Facet/Taxonomy/Directory/TestAddTaxonomy.cs
@@ -1,4 +1,5 @@
-using J2N.Threading;
+// Lucene version compatibility level 4.8.1
+using J2N.Threading;
 using J2N.Threading.Atomic;
 using NUnit.Framework;
 using System;
diff --git a/src/Lucene.Net.Tests.Facet/Taxonomy/Directory/TestConcurrentFacetedIndexing.cs b/src/Lucene.Net.Tests.Facet/Taxonomy/Directory/TestConcurrentFacetedIndexing.cs
index 162ca89..3c83af3 100644
--- a/src/Lucene.Net.Tests.Facet/Taxonomy/Directory/TestConcurrentFacetedIndexing.cs
+++ b/src/Lucene.Net.Tests.Facet/Taxonomy/Directory/TestConcurrentFacetedIndexing.cs
@@ -1,4 +1,5 @@
-using J2N.Threading.Atomic;
+// Lucene version compatibility level 4.8.1
+using J2N.Threading.Atomic;
 using System;
 using System.Collections.Concurrent;
 using System.IO;
diff --git a/src/Lucene.Net.Tests.Facet/Taxonomy/Directory/TestDirectoryTaxonomyReader.cs b/src/Lucene.Net.Tests.Facet/Taxonomy/Directory/TestDirectoryTaxonomyReader.cs
index 3db3e42..896c72f 100644
--- a/src/Lucene.Net.Tests.Facet/Taxonomy/Directory/TestDirectoryTaxonomyReader.cs
+++ b/src/Lucene.Net.Tests.Facet/Taxonomy/Directory/TestDirectoryTaxonomyReader.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Index.Extensions;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Index.Extensions;
 using NUnit.Framework;
 using System;
 using System.Globalization;
diff --git a/src/Lucene.Net.Tests.Facet/Taxonomy/Directory/TestDirectoryTaxonomyWriter.cs b/src/Lucene.Net.Tests.Facet/Taxonomy/Directory/TestDirectoryTaxonomyWriter.cs
index a33b6bd..faab773 100644
--- a/src/Lucene.Net.Tests.Facet/Taxonomy/Directory/TestDirectoryTaxonomyWriter.cs
+++ b/src/Lucene.Net.Tests.Facet/Taxonomy/Directory/TestDirectoryTaxonomyWriter.cs
@@ -1,4 +1,5 @@
-using J2N.Threading;
+// Lucene version compatibility level 4.8.1
+using J2N.Threading;
 using J2N.Threading.Atomic;
 using Lucene.Net.Attributes;
 using NUnit.Framework;
diff --git a/src/Lucene.Net.Tests.Facet/Taxonomy/TestCachedOrdinalsReader.cs b/src/Lucene.Net.Tests.Facet/Taxonomy/TestCachedOrdinalsReader.cs
index c5911bb..a1482d7 100644
--- a/src/Lucene.Net.Tests.Facet/Taxonomy/TestCachedOrdinalsReader.cs
+++ b/src/Lucene.Net.Tests.Facet/Taxonomy/TestCachedOrdinalsReader.cs
@@ -1,4 +1,5 @@
-using J2N.Threading;
+// Lucene version compatibility level 4.8.1
+using J2N.Threading;
 using NUnit.Framework;
 using System;
 using System.IO;
diff --git a/src/Lucene.Net.Tests.Facet/Taxonomy/TestFacetLabel.cs b/src/Lucene.Net.Tests.Facet/Taxonomy/TestFacetLabel.cs
index de7cef3..59960e0 100644
--- a/src/Lucene.Net.Tests.Facet/Taxonomy/TestFacetLabel.cs
+++ b/src/Lucene.Net.Tests.Facet/Taxonomy/TestFacetLabel.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Support;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Support;
 using NUnit.Framework;
 using System;
 using System.Globalization;
diff --git a/src/Lucene.Net.Tests.Facet/Taxonomy/TestLRUHashMap.cs b/src/Lucene.Net.Tests.Facet/Taxonomy/TestLRUHashMap.cs
index e2c37ca..20e75c9 100644
--- a/src/Lucene.Net.Tests.Facet/Taxonomy/TestLRUHashMap.cs
+++ b/src/Lucene.Net.Tests.Facet/Taxonomy/TestLRUHashMap.cs
@@ -1,4 +1,5 @@
-using NUnit.Framework;
+// Lucene version compatibility level 4.8.1
+using NUnit.Framework;
 using Assert = Lucene.Net.TestFramework.Assert;
 
 namespace Lucene.Net.Facet.Taxonomy
diff --git a/src/Lucene.Net.Tests.Facet/Taxonomy/TestSearcherTaxonomyManager.cs b/src/Lucene.Net.Tests.Facet/Taxonomy/TestSearcherTaxonomyManager.cs
index ae1d41f..055f5c7 100644
--- a/src/Lucene.Net.Tests.Facet/Taxonomy/TestSearcherTaxonomyManager.cs
+++ b/src/Lucene.Net.Tests.Facet/Taxonomy/TestSearcherTaxonomyManager.cs
@@ -1,4 +1,5 @@
-using J2N.Threading;
+// Lucene version compatibility level 4.8.1
+using J2N.Threading;
 using J2N.Threading.Atomic;
 using Lucene.Net.Attributes;
 using Lucene.Net.Index.Extensions;
diff --git a/src/Lucene.Net.Tests.Facet/Taxonomy/TestTaxonomyCombined.cs b/src/Lucene.Net.Tests.Facet/Taxonomy/TestTaxonomyCombined.cs
index a85954d..31f64e9 100644
--- a/src/Lucene.Net.Tests.Facet/Taxonomy/TestTaxonomyCombined.cs
+++ b/src/Lucene.Net.Tests.Facet/Taxonomy/TestTaxonomyCombined.cs
@@ -1,4 +1,5 @@
-using J2N.Threading;
+// Lucene version compatibility level 4.8.1
+using J2N.Threading;
 using J2N.Threading.Atomic;
 using Lucene.Net.Support;
 using NUnit.Framework;
diff --git a/src/Lucene.Net.Tests.Facet/Taxonomy/TestTaxonomyFacetAssociations.cs b/src/Lucene.Net.Tests.Facet/Taxonomy/TestTaxonomyFacetAssociations.cs
index 424233d..87913a1 100644
--- a/src/Lucene.Net.Tests.Facet/Taxonomy/TestTaxonomyFacetAssociations.cs
+++ b/src/Lucene.Net.Tests.Facet/Taxonomy/TestTaxonomyFacetAssociations.cs
@@ -1,4 +1,5 @@
-using NUnit.Framework;
+// Lucene version compatibility level 4.8.1
+using NUnit.Framework;
 using System;
 using Assert = Lucene.Net.TestFramework.Assert;
 
diff --git a/src/Lucene.Net.Tests.Facet/Taxonomy/TestTaxonomyFacetCounts.cs b/src/Lucene.Net.Tests.Facet/Taxonomy/TestTaxonomyFacetCounts.cs
index 2af17e1..9f2ef49 100644
--- a/src/Lucene.Net.Tests.Facet/Taxonomy/TestTaxonomyFacetCounts.cs
+++ b/src/Lucene.Net.Tests.Facet/Taxonomy/TestTaxonomyFacetCounts.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Index.Extensions;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Index.Extensions;
 using Lucene.Net.Support.IO;
 using NUnit.Framework;
 using System;
diff --git a/src/Lucene.Net.Tests.Facet/Taxonomy/TestTaxonomyFacetCounts2.cs b/src/Lucene.Net.Tests.Facet/Taxonomy/TestTaxonomyFacetCounts2.cs
index eaeab0b..fc89050 100644
--- a/src/Lucene.Net.Tests.Facet/Taxonomy/TestTaxonomyFacetCounts2.cs
+++ b/src/Lucene.Net.Tests.Facet/Taxonomy/TestTaxonomyFacetCounts2.cs
@@ -1,4 +1,5 @@
-using J2N.Collections.Generic.Extensions;
+// Lucene version compatibility level 4.8.1
+using J2N.Collections.Generic.Extensions;
 using Lucene.Net.Index;
 using Lucene.Net.Support;
 using NUnit.Framework;
diff --git a/src/Lucene.Net.Tests.Facet/Taxonomy/TestTaxonomyFacetSumValueSource.cs b/src/Lucene.Net.Tests.Facet/Taxonomy/TestTaxonomyFacetSumValueSource.cs
index b8dbc71..d911db9 100644
--- a/src/Lucene.Net.Tests.Facet/Taxonomy/TestTaxonomyFacetSumValueSource.cs
+++ b/src/Lucene.Net.Tests.Facet/Taxonomy/TestTaxonomyFacetSumValueSource.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Diagnostics;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Diagnostics;
 using NUnit.Framework;
 using System;
 using System.Collections;
diff --git a/src/Lucene.Net.Tests.Facet/Taxonomy/WriterCache/TestCharBlockArray.cs b/src/Lucene.Net.Tests.Facet/Taxonomy/WriterCache/TestCharBlockArray.cs
index c487c5f..e268fad 100644
--- a/src/Lucene.Net.Tests.Facet/Taxonomy/WriterCache/TestCharBlockArray.cs
+++ b/src/Lucene.Net.Tests.Facet/Taxonomy/WriterCache/TestCharBlockArray.cs
@@ -1,4 +1,5 @@
-using NUnit.Framework;
+// Lucene version compatibility level 4.8.1
+using NUnit.Framework;
 using System.IO;
 using System.Text;
 using Assert = Lucene.Net.TestFramework.Assert;
diff --git a/src/Lucene.Net.Tests.Facet/Taxonomy/WriterCache/TestCompactLabelToOrdinal.cs b/src/Lucene.Net.Tests.Facet/Taxonomy/WriterCache/TestCompactLabelToOrdinal.cs
index 456e189..b8d013a 100644
--- a/src/Lucene.Net.Tests.Facet/Taxonomy/WriterCache/TestCompactLabelToOrdinal.cs
+++ b/src/Lucene.Net.Tests.Facet/Taxonomy/WriterCache/TestCompactLabelToOrdinal.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Attributes;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Attributes;
 using NUnit.Framework;
 using System;
 using System.Collections.Generic;
diff --git a/src/Lucene.Net.Tests.Facet/TestDrillDownQuery.cs b/src/Lucene.Net.Tests.Facet/TestDrillDownQuery.cs
index 075ead5..3824e10 100644
--- a/src/Lucene.Net.Tests.Facet/TestDrillDownQuery.cs
+++ b/src/Lucene.Net.Tests.Facet/TestDrillDownQuery.cs
@@ -1,4 +1,5 @@
-using NUnit.Framework;
+// Lucene version compatibility level 4.8.1
+using NUnit.Framework;
 using System;
 using Assert = Lucene.Net.TestFramework.Assert;
 
diff --git a/src/Lucene.Net.Tests.Facet/TestDrillSideways.cs b/src/Lucene.Net.Tests.Facet/TestDrillSideways.cs
index b67f645..3d9f235 100644
--- a/src/Lucene.Net.Tests.Facet/TestDrillSideways.cs
+++ b/src/Lucene.Net.Tests.Facet/TestDrillSideways.cs
@@ -1,4 +1,5 @@
-using J2N.Collections.Generic.Extensions;
+// Lucene version compatibility level 4.8.1 + LUCENE-6001
+using J2N.Collections.Generic.Extensions;
 using J2N.Text;
 using Lucene.Net.Diagnostics;
 using Lucene.Net.Search;
diff --git a/src/Lucene.Net.Tests.Facet/TestFacetsConfig.cs b/src/Lucene.Net.Tests.Facet/TestFacetsConfig.cs
index 195291e..a984aa3 100644
--- a/src/Lucene.Net.Tests.Facet/TestFacetsConfig.cs
+++ b/src/Lucene.Net.Tests.Facet/TestFacetsConfig.cs
@@ -1,4 +1,5 @@
-using Lucene.Net.Support;
+// Lucene version compatibility level 4.8.1
+using Lucene.Net.Support;
 using NUnit.Framework;
 using Assert = Lucene.Net.TestFramework.Assert;
 
diff --git a/src/Lucene.Net.Tests.Facet/TestMultipleIndexFields.cs b/src/Lucene.Net.Tests.Facet/TestMultipleIndexFields.cs
index 74b5f0e..8f5b498 100644
--- a/src/Lucene.Net.Tests.Facet/TestMultipleIndexFields.cs
+++ b/src/Lucene.Net.Tests.Facet/TestMultipleIndexFields.cs
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+// Lucene version compatibility level 4.8.1
+using System.Collections.Generic;
 using NUnit.Framework;
 using Assert = Lucene.Net.TestFramework.Assert;
 
diff --git a/src/Lucene.Net.Tests.Facet/TestRandomSamplingFacetsCollector.cs b/src/Lucene.Net.Tests.Facet/TestRandomSamplingFacetsCollector.cs
index bb7d8fe..4f3f6e0 100644
--- a/src/Lucene.Net.Tests.Facet/TestRandomSamplingFacetsCollector.cs
+++ b/src/Lucene.Net.Tests.Facet/TestRandomSamplingFacetsCollector.cs
@@ -1,4 +1,5 @@
-using NUnit.Framework;
+// Lucene version compatibility level 4.8.1
+using NUnit.Framework;
 using System;
 using System.Globalization;
 using Assert = Lucene.Net.TestFramework.Assert;