docs: @Override
      public synchronized void unschedule() {
          verifyCanUnscheduleState();
          if (JobChangeLog.isEnabled()) {
              JobChangeLog.log("#job ...Unscheduling {}", toString());
          }
          unscheduled = true;
          cron4jId.ifPresent(id -> {
              cron4jNow.getCron4jScheduler().deschedule(id);
          });
      }