Github user uschindler commented on the pull request:
https://github.com/apache/lucenenet/pull/43#issuecomment-68868166
In Lucene 5, the fsync on directory may be more important, be cause we rely
on NIO.2's atomic rename functionality (we changed commit logic to make use of
that). So we fsync on the direcory after the atomic rename of the commit
(segments) file.
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