code: func (r *SearchRequest) TrackTotalHits(trackTotalHits interface{}) *SearchRequest {
  	r.searchSource = r.searchSource.TrackTotalHits(trackTotalHits)
  	return r
  }
docs: // TrackTotalHits indicates if the total hit count for the query should be tracked.
  // Defaults to true.
  //
  // See https://www.elastic.co/guide/en/elasticsearch/reference/7.0/search-request-track-total-hits.html
  // for details.