If doInitialSync terminates because the DataReplicator was shutdown, then it will return the current initial sync status if it has an error:
https://github.com/mongodb/mongo/blob/549c3f4315fd95431a662e7a8eff880f00b1458d/src/mongo/db/repl/data_replicator.cpp#L582-L587
https://github.com/mongodb/mongo/blob/549c3f4315fd95431a662e7a8eff880f00b1458d/src/mongo/db/repl/data_replicator.cpp#L691-L697

Rather than logging the shutdown status, we should log the initial sync status, and return the shutdown status so that the caller can differentiate a termination due to shutdown from a termination due to failure.