How to list records by ID using Node Express?

Look at the code below, it's working perfectly;

function getRestaurant(req, res){
    var restaurantId = req.params.id;

    Restaurant.findById(restaurantId).populate({path: 'user'}).exec((err, restaurant) => {
        if(err){
            res.status(500).send({
                message: 'Error na solicitação'
            });
        }else{
            if(!restaurant){
                res.status(404).send({
                    message: 'Não existe nenhum restaurante nesse registro'
                });
            }else{
                res.status(200).send({
                    restaurant
                });
            }
        }
    });
}

Here's the result:

You may notice that it is listing the record according to _id of MongoDB, however what I really need is to filter the record according to id that is the very attribute of the entity where you can view potato-gratin .

Please, how do I change the algorithm for entity list id's attribute?