code: public boolean unscheduleJob (final TriggerKey triggerKey) throws SchedulerException
    {
      validateState ();
  
      if (m_aResources.getJobStore ().removeTrigger (triggerKey))
      {
        notifySchedulerThread (0L);
        notifySchedulerListenersUnscheduled (triggerKey);
      }
      else
      {
        return false;
      }
  
      return true;
    }
docs: <p>
  Remove the indicated <code>{@link com.helger.quartz.ITrigger}</code> from
  the scheduler.
  </p>