Consolidate all IW locking inside IndexWriter #1454
Merged
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Today we still have one class that runs some tricky logic that should
be in the IndexWriter in the first place since it requires locking on
the IndexWriter itself. This change inverts the API and now FrozendBufferedUpdates
does not get the IndexWriter passed in, instead the IndexWriter owns most of the logic
and executes on a FrozenBufferedUpdates object. This prevent locking on IndexWriter out
side of the writer itself and paves the way to simplify some concurrency down the road