code: func (r *BulkUpdateRequest) DetectNoop(detectNoop bool) *BulkUpdateRequest {
  	r.detectNoop = &detectNoop
  	r.source = nil
  	return r
  }
docs: // DetectNoop specifies whether changes that don't affect the document
  // should be ignored (true) or unignored (false). This is enabled by default
  // in Elasticsearch.