Get a Collection instance with the default settings.

def _collection_default_options(self, name, **kargs):
        """Get a Collection instance with the default settings."""
        wc = (self.write_concern
              if self.write_concern.acknowledged else WriteConcern())
        return self.get_collection(
            name, codec_options=DEFAULT_CODEC_OPTIONS,
            read_preference=ReadPreference.PRIMARY,
            write_concern=wc)