Commits on Apr 9, 2015

1. Aggregations: Speed up include/exclude in terms aggregations with reg… …

   …exps.
   
   Today we check every regular expression eagerly against every possible term.
   This can be very slow if you have lots of unique terms, and even the bottleneck
   if your query is selective.
   
   This commit switches to Lucene regular expressions instead of Java (not exactly
   the same syntax yet most existing regular expressions should keep working) and
   uses the same logic as RegExpQuery to intersect the regular expression with the
   terms dictionary. I wrote a quick benchmark (in the PR) to make sure it made
   things faster and the same request that took 750ms on master now takes 74ms with
   this change.
   
   Close elastic#7526

   

   jpountz committed Apr 9, 2015
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