SOLR-4609: The Collections API should only send the reload command to ACTIVE cores. 

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1457874 13f79535-47bb-0310-9956-ffa450edef68
LUCENE4832: add ToParentBlockJoinCollector.getTopGroupsWithAllChildDocs

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1457886 13f79535-47bb-0310-9956-ffa450edef68