SOLR-4505: CHANGES entry

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1451656 13f79535-47bb-0310-9956-ffa450edef68
SOLR-4511: When a new index is replicated into place, we need to update the most recent replicatable index point without doing a commit. This is important for repeater use cases, as well as when nodes may switch master/slave roles.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1451659 13f79535-47bb-0310-9956-ffa450edef68