docs: public Observable<ServiceResponse<NetworkWatcherInner>> updateTagsWithServiceResponseAsync(String resourceGroupName, String networkWatcherName) {
          if (resourceGroupName == null) {
              throw new IllegalArgumentException("Parameter resourceGroupName is required and cannot be null.");
          }
          if (networkWatcherName == null) {
              throw new IllegalArgumentException("Parameter networkWatcherName is required and cannot be null.");
          }
          if (this.client.subscriptionId() == null) {
              throw new IllegalArgumentException("Parameter this.client.subscriptionId() is required and cannot be null.");
          }
          final String apiVersion = "2018-04-01";
          final Map<String, String> tags = null;
          TagsObject parameters = new TagsObject();
          parameters.withTags(null);
          return service.updateTags(resourceGroupName, networkWatcherName, this.client.subscriptionId(), apiVersion, this.client.acceptLanguage(), parameters, this.client.userAgent())
              .flatMap(new Func1<Response<ResponseBody>, Observable<ServiceResponse<NetworkWatcherInner>>>() {
                  @Override
                  public Observable<ServiceResponse<NetworkWatcherInner>> call(Response<ResponseBody> response) {
                      try {
                          ServiceResponse<NetworkWatcherInner> clientResponse = updateTagsDelegate(response);
                          return Observable.just(clientResponse);
                      } catch (Throwable t) {
                          return Observable.error(t);
                      }
                  }
              });
      }