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End-to-end upgrade testing (real parsedmarc 10.2.4 ingest, then a branch startup) surfaced that an exists query cannot see an empty string: a text field with no tokens is invisible to exists. The parsers we audited never store an auth result with an empty or missing domain — they drop such entries entirely, so the previous domain-only guard was sufficient for their data — but the storage shape of every historical parsedmarc version can't be audited, so the guard (and the documented manual command) now matches either the domain or the result subfield per protocol. Matching either costs nothing and cannot skip a document that has something to backfill. Verified by recomputing expected combined values from _source for all 2,299 documents on both engines: every document with stored auth results has exactly the recomputed pairs, and the legacy fo migration correctly did not fire on typeless indexes. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>