Jason Tedor 7ebba35c32 Handle already closed while filling gaps
We can hit an already closed exception when filling the gaps after
blocking operations when updating the primary term on a promoted replica
shard. We should catch this and suppress it as it is an expected outcome
instead of letting it bubble up which leads to trying to fail the shard
which throws yet another already closed exception.

Relates #25021
2017-06-02 08:05:33 -04:00
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