Add index and threads to trgt/merge

[fellen31]

PR checklist

Missed this in #9541.

• This comment contains a description of changes (with reason).
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[mashehu]

are there suppossed to be duplicated entries here, once with a key and once with an index?

[fellen31]

I don't really understand why there are duplicate entries though, I just have

        then {
            assertAll(
                { assert process.success },
                { assert snapshot(process.out).match() }
            )
        }

[mashehu]

looks to be standard, sorry. will think about how we can avoid that...