code: func (q MatchNoneQuery) Source() (interface{}, error) {
  	// {
  	//   "match_none" : { ... }
  	// }
  	source := make(map[string]interface{})
  	params := make(map[string]interface{})
  	source["match_none"] = params
  	if q.queryName != "" {
  		params["_name"] = q.queryName
  	}
  	return source, nil
  }
docs: // Source returns JSON for the match none query.