Cherry-pick #14359 to 7.5: [Filebeat] Race condition fix in S3 input plugin #14402
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Cherry-pick of PR #14359 to 7.5 branch. Original message:
During high load, Filebeat may crash due to the error channel
c.errC
having been closed before the last event has been acknowledged. This is caused by a missing critical section indone()
which can result inc.refs
no longer counting as expected.