code: private static String getJobName(JobExecutionPlan jobExecutionPlan) {
      return jobExecutionPlan.getJobSpec().getConfig().getString(ConfigurationKeys.JOB_NAME_KEY);
    }
docs: The job name is derived from the {@link ConfigurationKeys#JOB_NAME_KEY} config. It is assumed to be unique
  across all jobs in a {@link Dag}.
  @param jobExecutionPlan
  @return the name of the job.