code: def get_item_es(self, **kwargs):
          
          item_id = self._get_context_key(**kwargs)
          objects_ids = self._parent_queryset_es()
          if objects_ids is not None:
              objects_ids = self.get_es_object_ids(objects_ids)
  
          if six.callable(self.context):
              self.reload_context(es_based=True, **kwargs)
  
          if (objects_ids is not None) and (item_id not in objects_ids):
              raise JHTTPNotFound('{}(id={}) resource not found'.format(
                  self.Model.__name__, item_id))
  
          return self.context
docs: Get ES collection item taking into account generated queryset
          of parent view.
  
          This method allows working with nested resources properly. Thus an item
          returned by this method will belong to its parent view's queryset, thus
          filtering out objects that don't belong to the parent object.
  
          Returns an object retrieved from the applicable ACL. If an ACL wasn't
          applied, it is applied explicitly.