Using elasticsearch ongr

I created a document :

namespace AppBundle\Document;

use ONGR\ElasticsearchBundle\Annotation as ES;
use Pimcore\Model\DataObject\ProductSupplier as ProductSupplierEntity;

/**
 * ProductSupplier
 *
 * @ES\Document(type="product_supplier")
 */
class ProductSupplier extends ProductSupplierEntity
{
    /**
     * @var string
     *
     * @ES\Id()
     */
    public $id;

    /**
     * @var string
     *
     * @ES\Property(type="text", name="name")
     */
    public $name;
}

My config :

ongr_elasticsearch:
    managers:
        default:
            index:
                index_name: catalog
                hosts:
                    - 178.19.4.8:9200
            mappings:
                - AppBundle

Now when I trying to get the supplier with id 79 I get null :

public function getElasticSearchProductsAction(Request $request)
    {
        $manager = $this->get('es.manager.default');
        $repo    = $manager->getRepository('AppBundle:ProductSupplier');
        $supplier = $repo->find(79);
        $test = 1;

        return $this->json([]);
    }

Have you an idea about that ?