Prior to this ticket, commitTransaction for a sharded transaction waited for the commitment to complete on all participant shards before returning to the client. After this ticket, commitTransaction will return to the client as soon as the commit decision is persisted with the user's requested writeConcern. This behavior can be configured via the server parameter "coordinateCommitReturnImmediatelyAfterPersistingDecision".
Note that some component writes will still be performed with writeConcern
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