Bucket Script Help please

I’d like to create an alert based the the addition of 2 metrics. Source: Elasticseach 7.4.2, Grafana 7.3.1 (docker). I have looked at How to use Bucket Script many times as a point of reference.
I have added a third variable as shown but still not metrics appear when selected. Any advice would be greatly appreciated.

Got it to work.
All Metrics need to be under the SAME Query