lucene-solr:branch_6_6: Ref Guide: update upgrade notes for 6.6

[ct...@apache.org]

Repository: lucene-solr
Updated Branches:
  refs/heads/branch_6_6 4d055f00b -> fb1416ee8


Ref Guide: update upgrade notes for 6.6


Project: http://git-wip-us.apache.org/repos/asf/lucene-solr/repo
Commit: http://git-wip-us.apache.org/repos/asf/lucene-solr/commit/fb1416ee
Tree: http://git-wip-us.apache.org/repos/asf/lucene-solr/tree/fb1416ee
Diff: http://git-wip-us.apache.org/repos/asf/lucene-solr/diff/fb1416ee

Branch: refs/heads/branch_6_6
Commit: fb1416ee855806ad5b2f734572f68a0908a88a6c
Parents: 4d055f0
Author: Cassandra Targett <ca...@lucidworks.com>
Authored: Thu May 18 13:13:40 2017 -0500
Committer: Cassandra Targett <ca...@lucidworks.com>
Committed: Thu May 18 13:20:33 2017 -0500

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 solr/solr-ref-guide/src/upgrading-solr.adoc | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
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http://git-wip-us.apache.org/repos/asf/lucene-solr/blob/fb1416ee/solr/solr-ref-guide/src/upgrading-solr.adoc
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diff --git a/solr/solr-ref-guide/src/upgrading-solr.adoc b/solr/solr-ref-guide/src/upgrading-solr.adoc
index 6ec78f1..e5803d8 100644
--- a/solr/solr-ref-guide/src/upgrading-solr.adoc
+++ b/solr/solr-ref-guide/src/upgrading-solr.adoc
@@ -7,7 +7,11 @@ If you are already using Solr 6.5, Solr 6.6 should not present any major problem
 [[UpgradingSolr-Upgradingfrom6.5.x]]
 == Upgrading from 6.5.x
 
-* <TBD>
+* Solr contribs map-reduce, morphlines-core and morphlines-cell have been removed.
+
+* JSON Facet API now uses hyper-log-log for numBuckets cardinality calculation and calculates cardinality before filtering buckets by any mincount greater than 1.
+
+* ZooKeeper dependency has been upgraded from 3.4.6 to 3.4.10.
 
 [[UpgradingSolr-Upgradingfromearlier6.xversions]]
 == Upgrading from earlier 6.x versions