LUCENE-6086: Space optimizations for numeric stored fields.


git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1644663 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-6096: Avoid CMS which can close segments while we are measuring ram usage of the filter cache.


git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_5x@1644672 13f79535-47bb-0310-9956-ffa450edef68