Mongodb 3.6.0-rc3 array filters not working?

Question

I\'m trying to use array filters in mongodb 3.6.0-rc3, exactly like in doc example but not getting any rows affected and no error.

Example is simplified. I know this

Answer 1

db.getCollection('books').update({},
    {
        $set: { "authors.$[element].firstName": "Joe" }
    },
    {
        arrayFilters: [ { "element._id": ObjectId("some_id") } ],
        multi: true
    })