LUCENE-6132: add basic infostream message to SortingMergePolicy

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1647651 13f79535-47bb-0310-9956-ffa450edef68
SOLR-6729: createNodeSet.shuffle=(true|false) support for /admin/collections?action=CREATE.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1647656 13f79535-47bb-0310-9956-ffa450edef68