docs: public Mono<Response<ConfigurationSetting>> updateSetting(ConfigurationSetting setting) {
          // Validate that setting and key is not null. The key is used in the service URL so it cannot be null.
          validateSetting(setting);
  
          String etag = setting.etag() == null ? ETAG_ANY : setting.etag();
  
          return service.setKey(serviceEndpoint, setting.key(), setting.label(), setting, getETagValue(etag), null);
      }