add useful sop and fix tisNoIndex case (although thats not the bug here, test still fails)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1603594 13f79535-47bb-0310-9956-ffa450edef68
SOLR-6125: Allow SolrIndexWriter to close without waiting for merges

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1603601 13f79535-47bb-0310-9956-ffa450edef68
SOLR-6064: Return DebugComponent track output as JSON object

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1603610 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5773: Disable test temporarily.


git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1603618 13f79535-47bb-0310-9956-ffa450edef68