code: func (q *MoreLikeThisQuery) StopWord(stopWords ...string) *MoreLikeThisQuery {
  	q.stopWords = append(q.stopWords, stopWords...)
  	return q
  }
docs: // StopWord sets the stopwords. Any word in this set is considered
  // "uninteresting" and ignored. Even if your Analyzer allows stopwords,
  // you might want to tell the MoreLikeThis code to ignore them, as for
  // the purposes of document similarity it seems reasonable to assume that
  // "a stop word is never interesting".