code: func NewBoolQuery() *BoolQuery {
  	return &BoolQuery{
  		mustClauses:    make([]Query, 0),
  		mustNotClauses: make([]Query, 0),
  		filterClauses:  make([]Query, 0),
  		shouldClauses:  make([]Query, 0),
  	}
  }
docs: // Creates a new bool query.