code: public Observable<Void> resendEmailAsync(String resourceGroupName, String certificateOrderName) {
          return resendEmailWithServiceResponseAsync(resourceGroupName, certificateOrderName).map(new Func1<ServiceResponse<Void>, Void>() {
              @Override
              public Void call(ServiceResponse<Void> response) {
                  return response.body();
              }
          });
      }
docs: Resend certificate email.
  Resend certificate email.
  
  @param resourceGroupName Name of the resource group to which the resource belongs.
  @param certificateOrderName Name of the certificate order.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceResponse} object if successful.