Pass Entire Document into Update Script Params

According to Update settings (when writing to Elasticsearch), I can provide a list of fields to be passed into my update script params with es.update.script.params. Is there a way to say I want the entire document being indexed to be passed in? Essentially all fields without explicitly listing each one?

I realize I could just wrap the whole document in a single dummy field and list that in params but I'm performing upserts and don't want that dummy wrapper in the document if it does an insert.

I'm using es.input.json = true

Hmm, this is an interesting use case. I've never really thought of that before. Worth opening an enhancement issue on the github project.