SOLR-4589: Fixed CPU spikes and poor performance in lazy field loading of multivalued fields

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1458887 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-4856: If there are no matches for a given field, return the first maxPassages sentences

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1458889 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-4859: Expose more stats on IndexReader

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1458907 13f79535-47bb-0310-9956-ffa450edef68