code: func (s *IndicesFlushService) AllowNoIndices(allowNoIndices bool) *IndicesFlushService {
  	s.allowNoIndices = &allowNoIndices
  	return s
  }
docs: // AllowNoIndices indicates whether to ignore if a wildcard indices expression
  // resolves into no concrete indices. (This includes `_all` string or when
  // no indices have been specified).