docs: public Future<Void> forceClose() {
      this.close();
      if (forceClosing.compareAndSet(false, true) && channel.isOpen()) {
        writeCoalescer
            .writeAndFlush(channel, FORCEFUL_CLOSE_MESSAGE)
            .addListener(UncaughtExceptions::log);
      }
      return channel.closeFuture();
    }