code: func (manager *basicStateManager) ForceSave() error {
  	manager.savingLock.Lock()
  	defer manager.savingLock.Unlock()
  	log.Info("Saving state!")
  	s := manager.state
  	s.Version = ECSDataVersion
  
  	data, err := json.Marshal(s)
  	if err != nil {
  		log.Error("Error saving state; could not marshal data; this is odd", "err", err)
  		return err
  	}
  	return manager.writeFile(data)
  }
docs: // ForceSave saves the given State to a file. It is an atomic operation on POSIX
  // systems (by Renaming over the target file).
  // This function logs errors at will and does not necessarily expect the caller
  // to handle the error because there's little a caller can do in general other
  // than just keep going.
  // In addition, the StateManager internally buffers save requests in order to
  // only save at most every STATE_SAVE_INTERVAL.