1const firestore = firebase.firestore();
2// get the data from 'name@xxx.com'
3firestore.collection("users").doc("name@xxx.com").get().then(function (doc) {
4 if (doc && doc.exists) {
5 var data = doc.data();
6 // saves the data to 'name'
7 firestore.collection("users").doc("name").set(data).then({
8 // deletes the old document
9 firestore.collection("users").doc("name@xxx.com").delete();
10 });
11 }
12});
13