code: func (q *MoreLikeThisQuery) FailOnUnsupportedField(fail bool) *MoreLikeThisQuery {
  	q.failOnUnsupportedField = &fail
  	return q
  }
docs: // FailOnUnsupportedField indicates whether to fail or return no result
  // when this query is run against a field which is not supported such as
  // a binary/numeric field.