This looks valid.
I believe you could accomplish the same with a few filters though, which might be more performant.
match list of case ids: `{"terms": {"form.case.@case_id": filtered_case_ids}}`
match xmlns: `{"terms": {"xmlns.exact": CASE_FORM_SCRIPT_FILTER_NAMESPACES}}`
match visit range: `{"range": {"form.visits": {"gte": 1, "lte": 4}}}`