Nhat Nguyen 1a3f9e5a07 Return true for can_match on idle search shards (#55428)
With this change, we will always return true for can_match requests on
idle search shards; otherwise, some shards will never get refreshed if
all search requests perform the can_match phase (i.e., total shards >
pre_filter_shard_size).

Relates #27500
Relates #50043
2020-04-26 22:21:42 -04:00
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