Как использовать RabbitMqBundle в Symfony4?

old_sound_rabbit_mq:
    connections:
        default:
            url: '%env(RABBITMQ_URL)%'
    producers:
        # use 'old_sound_rabbit_mq.task_producer' service to send data.
        task:
            connection:       default
            exchange_options: { name: 'task', type: direct }

<?php

namespace App\Controller;

use App\Entity\Setting;
use App\Form\SettingType;
use App\Repository\SettingRepository;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;

/**
 * @Route("/setting")
 */
class SettingController extends AbstractController
{
public function edit(Request $request, Setting $setting): Response
{
    $form = $this->createForm(SettingType::class, $setting);
    $form->handleRequest($request);

    if ($form->isSubmitted() && $form->isValid()) {
        $this->getDoctrine()->getManager()->flush();

        //////////// Send msg to queue ////////////
            $msg = ['msg' => "Settings was changed!"];
            $this->get('old_sound_rabbit_mq.task_producer')->publish(serialize($msg));
        ////////////////////////////////////////////////

        return $this->redirectToRoute('setting_index');
    }

    return $this->render('setting/edit.html.twig', [
        'setting' => $setting,
        'form' => $form->createView(),
    ]);
}
}