如何在mongoose中替换文档中的文本？

const mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true });

const mySchema = new mongoose.Schema({
  name: String,
  age: Number,
  description: String
});

const MyModel = mongoose.model('MyModel', mySchema);

MyModel.findOneAndUpdate(
  { name: 'John' }, // 查询条件
  { $set: { description: 'New description' } }, // 更新操作
  { new: true } // 返回更新后的文档
)
.then(updatedDoc => {
  console.log(updatedDoc);
})
.catch(error => {
  console.error(error);
});