Returns the index keys to be used by the collection for the given args

        For the parameters, see BaseIndex.get_filtered_keys

def get_filtered_keys(self, suffix, *args, **kwargs):
        """Returns the index keys to be used by the collection for the given args

        For the parameters, see BaseIndex.get_filtered_keys

        """

        args = self.prepare_args(args, transform=False)

        for index in self._indexes:
            if index.can_handle_suffix(suffix):
                return index.get_filtered_keys(suffix, *args, **kwargs)