问如何使用NodeJS更新子文档mongoose

EN

const mongoose = require('mongoose');  
var emailSchema = new mongoose.Schema({     subscriberEmail: String,    sendedEmail: Array,     },     {        versionKey: false     } )  
var Email = mongoose.model('Email', emailSchema); 
module.exports = Email;

updateEmail: (req, res) => {
        let Id = req.params.id;
        Email.findById(Id, (err, res) =>{
            if(err) return res.status(500).send({message: 'Error to find'});        
        }); 

        let update = req.body;
        Email.findByIdAndUpdate(Id, update, {new: true}, (err, EmailUpdated) => {
            if(err) return res.status(500).send({message: 'Error while updating'});
            if(!EmailUpdated) return res.status(404).send({message: 'Email doesnt exist'});
            return res.status(200).send({email: EmailUpdated});
        });
    },