code: public Observable<Void> beginRestartAsync(String resourceGroupName, String containerGroupName) {
          return beginRestartWithServiceResponseAsync(resourceGroupName, containerGroupName).map(new Func1<ServiceResponse<Void>, Void>() {
              @Override
              public Void call(ServiceResponse<Void> response) {
                  return response.body();
              }
          });
      }
docs: Restarts all containers in a container group.
  Restarts all containers in a container group in place. If container image has updates, new image will be downloaded.
  
  @param resourceGroupName The name of the resource group.
  @param containerGroupName The name of the container group.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceResponse} object if successful.