code: func (sh *ScriptSignificanceHeuristic) Script(script *Script) *ScriptSignificanceHeuristic {
  	sh.script = script
  	return sh
  }
docs: // Script specifies the script to use to get custom scores. The following
  // parameters are available in the script: `_subset_freq`, `_superset_freq`,
  // `_subset_size`, and `_superset_size`.
  //
  // See https://www.elastic.co/guide/en/elasticsearch/reference/7.0/search-aggregations-bucket-significantterms-aggregation.html#_scripted
  // for details.