'has_visit' means a full visit; which we can not tell from a
visit object anymore; only visit statuses hold this data.
Resolves T2936
Migration for staging:
1. `curl -XPOST "https://localhost:9200/origin/_update_by_query" -d'{"script": {"inline": "ctx._source.has_visits = false", "lang": "painless"}}'`
2. reset the offset of the swh-search client on the `swh.journal.objects.origin_visit_status` topic