Nhat Nguyen f8ef402027 Do not warm up searcher in engine constructor (#48605)
With this change, we won't warm up searchers until we externally refresh
an engine. We explicitly refresh before allowing reading from a shard
(i.e., move to post_recovery state) and during resetting. These
guarantees that we have warmed up the engine before exposing the
external searcher.

Another prerequisite for #47186.
2019-10-30 14:22:59 -04:00
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