Commits on Sep 3, 2014

1. Core: Change the default cache filter impl from FixedBitSet to WAH8Do… …

   …cIdSet.
   
   A few months ago, Lucene switched from FixedBitSet to WAH8DocIdSet in order
   to cache filters. WAH8DocIdSet is especially better when dealing with sparse
   sets: iteration is faster, memory usage is lower and there is an index that
   helps keep advance fast.
   
   This doesn't break existing code since elastic#6280 already made sure that there was no
   abusive cast from DocIdSet to Bits or FixedBitSet and elastic#7037 moved consumers of
   the filter cache that absolutely need to get fixed bitsets to their own cache.
   
   Since cached filters will be more memory-efficient, the filter cache size has
   been decreased from 10 to 5%. Although smaller, this might still allow to cache
   more filters.

   

   jpountz committed Sep 3, 2014
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