code: def raw(self):
          
          es = self.get_es()
  
          params = dict(self.query_params)
          mlt_fields = self.mlt_fields or params.pop('mlt_fields', [])
  
          body = self.s.build_search() if self.s else ''
  
          hits = es.mlt(
              index=self.index, doc_type=self.doctype, id=self.id,
              mlt_fields=mlt_fields, body=body, **params)
  
          log.debug(hits)
  
          return hits
docs: Build query and passes to `Elasticsearch`, then returns the raw
          format returned.