code: public Observable<Void> getAsync(String vaultName, String resourceGroupName, String jobName, String operationId) {
          return getWithServiceResponseAsync(vaultName, resourceGroupName, jobName, operationId).map(new Func1<ServiceResponse<Void>, Void>() {
              @Override
              public Void call(ServiceResponse<Void> response) {
                  return response.body();
              }
          });
      }
docs: Gets the result of the operation.
  
  @param vaultName The name of the Recovery Services vault.
  @param resourceGroupName The name of the resource group associated with the Recovery Services vault.
  @param jobName Job name associated with this GET operation.
  @param operationId OperationID associated with this GET operation.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceResponse} object if successful.