3.3 Database Index Setup

From the Firestore Database, Click on the Indexes tab and click on the Add Index. You have to create one index for the database.
Enter questions as Collection ID, quiz_id into the first field and set Ascending, Enter created_at in the second field and set Ascending and then select Collection as query scope.
Now click on the Create Index and the index will be created for you. This may take 3-5 minutes to activate. After completing this, your index page should look like this :