code: synchronized void unschedule(String scheduledJobId) {
      try {
        quartzScheduler.deleteJob(new JobKey(scheduledJobId, SCHEDULED_JOB_GROUP));
      } catch (SchedulerException e) {
        String message = format("Error deleting ScheduledJob ''{0}''", scheduledJobId);
        LOG.error(message, e);
        throw new ScheduledJobException(message, e);
      }
    }
docs: Remove a job from the quartzScheduler
  
  @param scheduledJobId ID of the ScheduledJob to unschedule