我不认为有一种更改文档ID的方法，但是即使有某种方法，您所做的事情也绝对是错误的.该ID应该是唯一标识符，让自己成为UserID字段，例如，使用Firebase Auth使用firebase.Auth().currentUser.uid作为Firestore中用户特定的已保存数据的ID.

I dont think there is a way to Change the Document ID, but even if there is a way what you do is horribly wrong. The ID should be a Unique Identifier, make yourself a UserID Field, for example with Firebase Auth use firebase.Auth().currentUser.uid as the ID of your User specific saved data in the Firestore.

我建议您总体上进行更改，以解决您的问题，更重要的是为您提供坚实的结构. (身份验证中的UID是唯一的)

I Suggest you to Change that in General that solves your Problem and more importantly gives you a solid structure. (The UID from the Auth is Unique)