docs: @Override
      public void stop(){
          if (isStarted.compareAndSet(true,false)) {
              // if you shutdown it, it can not be use anymore
              super.stop();
              ScheduledExecutorService service = this.syncService.getAndSet(newSyncService());
              service.shutdown();
              LOGGER.info("Cache sync Service is shutdown");
              for (Entry<String,ModelServiceClientCache> entry : cache.entrySet()){
                 removeInstanceChangeListener(entry.getKey(),entry.getValue());
              }
              getCache().clear();
          }
      }