ES: geo spatial filter

apps/search_indexes/views.py

@@ -1,7 +1,8 @@
 """Search indexes app views."""
 from rest_framework import permissions
 from django_elasticsearch_dsl_drf import constants
-from django_elasticsearch_dsl_drf.filter_backends import FilteringFilterBackend
+from django_elasticsearch_dsl_drf.filter_backends import (FilteringFilterBackend,
+                                                          GeoSpatialFilteringFilterBackend)
 from django_elasticsearch_dsl_drf.viewsets import BaseDocumentViewSet
 from django_elasticsearch_dsl_drf.pagination import PageNumberPagination
 from search_indexes import serializers, filters
@@ -47,6 +48,7 @@ class EstablishmentDocumentViewSet(BaseDocumentViewSet):
     filter_backends = [
         FilteringFilterBackend,
         filters.CustomSearchFilterBackend,
+        GeoSpatialFilteringFilterBackend,
     ]
 
     search_fields = (
@@ -96,3 +98,12 @@ class EstablishmentDocumentViewSet(BaseDocumentViewSet):
             'field': 'collections.collection_type'
         },
     }
+
+    geo_spatial_filter_fields = {
+        'location': {
+            'field': 'address.location',
+            'lookups': [
+                constants.LOOKUP_FILTER_GEO_BOUNDING_BOX,
+            ]
+        }
+    }