don't use Lucene3X

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1597064 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5683: remove inefficiencies in getXXXDocValues from SegmentReader

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1597069 13f79535-47bb-0310-9956-ffa450edef68