docs: def serialize_search(self, pid_fetcher, search_result,
                           item_links_factory=None, **kwargs):
          """Serialize a search result.
  
          :param pid_fetcher: Persistent identifier fetcher.
          :param search_result: Elasticsearch search result.
          :param item_links_factory: Factory function for the items in result.
              (Default: ``None``)
          :returns: The objects serialized.
          """
          ret = [self.transform_search_hit(pid_fetcher(hit['_id'],
                                           hit['_source']),
                                           hit,
                                           links_factory=item_links_factory)
                 for hit in search_result['hits']['hits']]
  
          return dumps(ret, **self.dumps_kwargs)