optimize index nested/object fields (django-es#412)

Co-authored-by: Alexander Myskin <[email protected]>
Co-authored-by: Safwan Rahman <[email protected]>

Author: 3 people

django_elasticsearch_dsl/fields.py

@@ -112,6 +112,7 @@ def _get_inner_field_data(self, obj, field_value_to_ignore=None):
                     obj, field_value_to_ignore
                 )
         else:
+            doc_instance = self._doc_class()
             for name, field in self._doc_class._doc_type.mapping.properties._params.get(
                 'properties', {}).items():  # noqa
                 if not isinstance(field, DEDField):
@@ -121,7 +122,6 @@ def _get_inner_field_data(self, obj, field_value_to_ignore=None):
                     field._path = [name]
 
                 # This allows for retrieving data from an InnerDoc with prepare_field_name functions.
-                doc_instance = self._doc_class()
                 prep_func = getattr(doc_instance, 'prepare_%s' % name, None)
 
                 if prep_func: