Nhat Nguyen 80a9a08b05 Fix leaking searcher when shards are removed or relocated (#52099)
We might leak a searcher if the target shard is removed (i.e., its index
is deleted) or relocated while we are creating a SearchContext from a
SearchRewriteContext.

Relates #51708
Closes #52021

I labelled this non-issue for an unreleased bug introduced in #51708.
2020-02-09 22:13:35 -05:00
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