public function clientes(Request $request)
    {
        $envelope  = new Envelope();
        $documento = $request->get('q');
        $clientes  = $this
            ->getDoctrine()
            ->getManager()
            ->getRepository(Cliente::class)
            ->findByDocumento("{$documento}%");
        
        $envelope->setData($clientes);

        return $this->json($envelope);
    }