How do you set the .indexOn rule for a path?
I have this error message:
FIREBASE WARNING: Using an unspecified index. Consider adding ".indexOn": "userItem_ID" at /apps/d0c1d145-448a-493b-8fda-803b09935429/appData/PageNewProduct to your security rules for better performance
You can't write a key with a "/" character, so how do you specify the path of the key to be indexed?