[RFC] Give SegmentWriter a cachable Searcher #8
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When repeatedly calling `update_document()`, each call instantiates a `Searcher`, which is expensive. The `SegmentWriter` already has a write lock on the index, so if the conditions are right, let's cache a `Searcher`, override its closing method to keep it open, and close it on `_finish()` if it's around.
Also don't cache a `Searcher` if the `SegmentWriter` is closed.
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Adding and merging PR #15 from the mchaput/whoosh repo.