add slug && preview_image_url to search results

apps/search_indexes/documents/establishment.py

@@ -84,6 +84,8 @@ class EstablishmentDocument(Document):
             'name',
             'toque_number',
             'price_level',
+            'preview_image_url',
+            'slug',
         )
 
     def get_queryset(self):

apps/search_indexes/serializers.py

@@ -63,6 +63,8 @@ class EstablishmentDocumentSerializer(DocumentSerializer):
             'collections',
             'establishment_type',
             'establishment_subtypes',
+            'preview_image_url',
+            'slug',
         )
 
     @staticmethod