I've spoke to benety.goh, and we believe the only users of this class are working with non-replicated collections, but if it were ever to be used with replicated collections, this lock acquisition is a bit suspect. Namely, it is not using AutoGetCollectionForRead even though it might perform reads. AutoGetCollectionForRead will ensure that a user's request for a readConcern of majority will be met, which maybe should happen here.