Nhat Nguyen ff6c121eb9 Closed shard should never open new engine (#47186)
We should not open new engines if a shard is closed. We break this
assumption in #45263 where we stop verifying the shard state before
creating an engine but only before swapping the engine reference.
We can fail to snapshot the store metadata or checkIndex a closed shard
if there's some IndexWriter holding the index lock.

Closes #47060
2019-11-08 23:40:34 -05:00
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