How to subtract between two fields?

New to this but tried to follow the Elastic docs and it didn't work for me. Trying to create a Visualizer where I want to subtract field1 from field2 using the Advanced JSON scripting. Keeps saying I have an error but not sure what the error is. Tried also with 'Filters' aggregation and got same result. I must be missing something very simple so please guide me; please see attached screenshots. Thanks.


You will probably want to create a scripted field instead

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