SOLR-4817 Solr should not fall back to the back compat built in solr.xml in SolrCloud mode.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1517398 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5187: Make SlowCompositeReaderWrapper's constructor private.


git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1517447 13f79535-47bb-0310-9956-ffa450edef68