[Lucene-java Wiki] Update of "ReleaseNote720" by jimczi

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The "ReleaseNote720" page has been changed by jimczi:
https://wiki.apache.org/lucene-java/ReleaseNote720?action=diff&rev1=5&rev2=6

- ## page was copied from ReleaseNote72
- = 21 December 2017, Apache Lucene™ 7.2.0 available =
+ = XX January 2018, Apache Lucene™ 7.2.1 available =
  
- The Lucene PMC is pleased to announce the release of Apache Lucene 7.2.0.
+ The Lucene PMC is pleased to announce the release of Apache Lucene 7.2.1.
  
  Apache Lucene is a high-performance, full-featured text search engine library written entirely in Java. It is a technology suitable for nearly any application that requires full-text search, especially cross-platform.
  
@@ -12, +11 @@

  http://lucene.apache.org/core/mirrors-core-latest-redir.html
  Please read CHANGES.txt for a full list of new features and changes:
  
- https://lucene.apache.org/core/7_2_0/changes/Changes.html
+ https://lucene.apache.org/core/7_2_1/changes/Changes.html
  
+ Lucene 7.2.1 Bug Fixes:
+  * Fix advancedExact on SortedNumericDocValues produced by Lucene54DocValuesProducer.
- Lucene 7.2.0 Release Highlights:
-  * Specific query implementations can now opt out of caching.
-  * !TopFieldDocCollector can now early terminate collection of matches when the index is sorted and the total hit count is not requested.
-  * !IndexWriter#flushNextBuffer gives more fine-grained control over the memory usage of !IndexWriter.
-  * Fixed document accounting in !IndexWriter.
-  * Query scores can be exposed in a !ValuesSource using !DoubleValuesSource.fromQuery().
  
  
- Further details of changes are available in the change log available at: http://lucene.apache.org/core/7_2_0/changes/Changes.html
+ Further details of changes are available in the change log available at: http://lucene.apache.org/core/7_2_1/changes/Changes.html
  
  Please report any feedback to the mailing lists (http://lucene.apache.org/core/discussion.html)