def _get_index_class_name(self, index_cls):
        """
        Converts in index model class to a name suitable for use as a field name prefix. A user
        may optionally specify custom aliases via an 'index_aliases' attribute on the Meta class
        """
        cls_name = index_cls.__name__
        aliases = self.Meta.index_aliases
        return aliases.get(cls_name, cls_name.split('.')[-1])