elasticsearch/elasticsearch — pull request #8934 by mikemccand (2014-12-12 19:59:57+00:00)
Title: Core: use Lucene's defaults for compound file format

This just switches to Lucene's default for compound files, which is to use compound file format for merged segments that are < 10% of the total index size. ES already uses Lucene's default (true) for newly flushed segments.

Closes #8919