a.py

class AnimalDoc(Document):

    _id = Text()

    class Index:
        name = 'animal'



# Object type definition
class Animal(ElasticsearchObjectType):

    class Meta(object):
        document = AnimalDoc
        # interfaces = (Node,)
        filter_backends = [
            FilteringFilterBackend,
            SearchFilterBackend,
            OrderingFilterBackend,
            DefaultOrderingFilterBackend,
        ]


        # For `FilteringFilterBackend` backend
        filter_fields = {
            '_id': {
                'field': '_id.keyword',
                'default_lookup': LOOKUP_FILTER_TERM,
            }
        }

class AnimalQuery(graphene.ObjectType):
    all_animals = ElasticsearchConnectionField(Animal)