Unlocks a mongod instance to allow writes and reverses the
operation of a db.fsyncLock() operation. Typically you will
use db.fsyncUnlock() following a database backup
db.fsyncUnlock() is an administrative operation.
With WiredTiger, the db.fsyncLock() and db.fsyncUnlock() operations cannot guarantee that the data
files do not change. As a result, do not use these methods to ensure
consistency for the purposes of creating backups.
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