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Author:
{'name': 'Daniel Gottlieb', 'username': 'dgottlieb', 'email': 'daniel.gottlieb@mongodb.com'}
Message: SERVER-31948: Do not lock the `_indexObserverMutex` on the `informIndexObserver` code path.
IndexObservers were part of the background collection/index consistency validation, but
the feature did not make it in for 3.6. IndexObservers currently cannot be installed, so
we'll gain some perf by not locking the mutex for what is otherwise a no-op.
Branch: master
https://github.com/mongodb/mongo/commit/9dfa7ab336623d435c9aa5d7192973706a047294
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