Currently queries are done using the NamespaceString of an oplog entry. We want to add new functions that will allow us to query information from the sync source node using the UUID instead of the NamespaceString. We will need new functions such as:

RollbackSource::findOne(const BSONElement& ui, const BSONObj& filter)
RollbackSource::getCollectionInfo(const BSONElement& ui)
Database::dropCollectionEvenIfSystem(OperationContext* opCtx, const BSONElement& ui)