SOLR-6592: add mention in solr/CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1631462 13f79535-47bb-0310-9956-ffa450edef68
SOLR-6592: add mention in solr/CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1631464 13f79535-47bb-0310-9956-ffa450edef68
SOLR-6592: add mention in solr/CHANGES.txt

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1631467 13f79535-47bb-0310-9956-ffa450edef68