code: @Override
    public void stop() {
      if (!isStopped()) {
        if (lifeCycle.address().id() != World.DEADLETTERS_ID) {
          // TODO: remove this actor as a child on parent
          lifeCycle.suspend();
          lifeCycle.stop(this);
        }
      }
    }
docs: Initiates the process or stopping this {@code Actor} and all of its children.