dbCheck is used to check the consistency between replica set members, as part of this the primary emits oplog entries containing a description of the data in each collection.At the same time this process can be very long lasting.

When we expand Operation FCV to cover all operations (including dbCheck) then we should review what the expected behavior is. A priori the generic approach of waiting for a short amount of time then killing the operation with a retriable error should work, but we should review if that's acceptable for dbCheck as well.