How to create a composite index for boolean field in Firebase?

Im working with my PHP & Firebase project

I have this query code below in my PHP file

$query = $ref->orderBy('date', 'DESC')->where("isDeleted", "=", false);

This give me a Exception FailedPreconditionException and a message The query requires an index follow by a composite index link

• I tried to copy & paste the link provided, but nothing happen.

• So I try to create a index in firebase console manually, with the postDate as DESC and isDeleted as ASC and nothing happen.