code: public Observable<JobInner> updateAsync(String resourceGroupName, String accountName, String transformName, String jobName, JobInner parameters) {
          return updateWithServiceResponseAsync(resourceGroupName, accountName, transformName, jobName, parameters).map(new Func1<ServiceResponse<JobInner>, JobInner>() {
              @Override
              public JobInner call(ServiceResponse<JobInner> response) {
                  return response.body();
              }
          });
      }
docs: Update Job.
  Update is only supported for description and priority. Updating Priority will take effect when the Job state is Queued or Scheduled and depending on the timing the priority update may be ignored.
  
  @param resourceGroupName The name of the resource group within the Azure subscription.
  @param accountName The Media Services account name.
  @param transformName The Transform name.
  @param jobName The Job name.
  @param parameters The request parameters
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the JobInner object