code: func (q *QueryStringQuery) LowercaseExpandedTerms(lowercaseExpandedTerms bool) *QueryStringQuery {
  	q.lowercaseExpandedTerms = &lowercaseExpandedTerms
  	return q
  }
docs: // LowercaseExpandedTerms indicates whether terms of wildcard, prefix, fuzzy
  // and range queries are automatically lower-cased or not. Default is true.
  //
  // Deprecated: Decision is now made by the analyzer.