minor optimization

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1534787 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5300: Check that the supplied hash ranges actually cover the entire range of the shard

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1534974 13f79535-47bb-0310-9956-ffa450edef68