code: func (s *IndicesGetSettingsService) ExpandWildcards(expandWildcards string) *IndicesGetSettingsService {
  	s.expandWildcards = expandWildcards
  	return s
  }
docs: // ExpandWildcards indicates whether to expand wildcard expression
  // to concrete indices that are open, closed or both.
  // Options: open, closed, none, all. Default: open,closed.