LUCENE-4972: DirectoryTaxonomyWriter makes a commit even if no changes were made

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1478638 13f79535-47bb-0310-9956-ffa450edef68
SOLR-4711: Ignore the always failing tests when executes with Java 8

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1478701 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-4976: use single file to hold PersistentSnapshotDeletionPolicy state on disk

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1478726 13f79535-47bb-0310-9956-ffa450edef68
make SearcherAndTaxonomy ctor public

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1478729 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-4946: Refactor SorterTemplate (now Sorter).


git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1478785 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-4946: Re-add the random-access checks that have been lost during refactoring.


git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1478801 13f79535-47bb-0310-9956-ffa450edef68