LUCENE-6077: Add a filter cache.


git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1642185 13f79535-47bb-0310-9956-ffa450edef68
more test tuning

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1642203 13f79535-47bb-0310-9956-ffa450edef68
less simpletext, less simplefsdir, put directdv in rotation

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1642211 13f79535-47bb-0310-9956-ffa450edef68
remove unnecessary build dependency

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1642213 13f79535-47bb-0310-9956-ffa450edef68