MongoDB node.js : Delete a document automatically after 10 seconds

I want to delete a document automatically after 10 seconds of creating It , but I don’t know why my code doesn’t works (Document not deleted after 10 seconds)

const timestamp = new Date().getTime()

await db.collection("admin_msg").insertOne({createdAt : timestamp , expiresIn : timestamp + 10000 });
await db.collection("admin_msg").createIndex({ expireAt: 1}, { expireAfterSeconds: 10 });