code: public Observable<Void> deleteEventHubConsumerGroupAsync(String resourceGroupName, String resourceName, String eventHubEndpointName, String name) {
          return deleteEventHubConsumerGroupWithServiceResponseAsync(resourceGroupName, resourceName, eventHubEndpointName, name).map(new Func1<ServiceResponse<Void>, Void>() {
              @Override
              public Void call(ServiceResponse<Void> response) {
                  return response.body();
              }
          });
      }
docs: Delete a consumer group from an Event Hub-compatible endpoint in an IoT hub.
  Delete a consumer group from an Event Hub-compatible endpoint in an IoT hub.
  
  @param resourceGroupName The name of the resource group that contains the IoT hub.
  @param resourceName The name of the IoT hub.
  @param eventHubEndpointName The name of the Event Hub-compatible endpoint in the IoT hub.
  @param name The name of the consumer group to delete.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceResponse} object if successful.