code: public Observable<Void> cancelAsync(String resourceGroupName, String serverName, String jobAgentName, String jobName, UUID jobExecutionId) {
          return cancelWithServiceResponseAsync(resourceGroupName, serverName, jobAgentName, jobName, jobExecutionId).map(new Func1<ServiceResponse<Void>, Void>() {
              @Override
              public Void call(ServiceResponse<Void> response) {
                  return response.body();
              }
          });
      }
docs: Requests cancellation of a job execution.
  
  @param resourceGroupName The name of the resource group that contains the resource. You can obtain this value from the Azure Resource Manager API or the portal.
  @param serverName The name of the server.
  @param jobAgentName The name of the job agent.
  @param jobName The name of the job.
  @param jobExecutionId The id of the job execution to cancel.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceResponse} object if successful.