[openstreetmap/openstreetmap-website] admin_level in search results sometimes off by one (Issue #6870)

[Sarah Hoffmann]

lonvia left a comment (openstreetmap/openstreetmap-website#6870)

You are looking at the wrong piece of code. The relevant part for Nominatim search is

https://github.com/openstreetmap/openstreetmap-website/blob/bfa93794a6be5d02b3a9b024de8b88efd212e024/app/controllers/searches/nominatim_queries_controller.rb#L36

Not withstanding that `place_rank` should be used here rather than `address_rank`, it still wouldn't work for the Netherlands because Nominatim [fiddles with the ranks in that country](https://github.com/osm-search/Nominatim/blob/d43e95f177040ed98c4d6aeddb9bc24d149b39c7/settings/address-levels.json#L198).

Long story short, to fix this a) Nominatim should be changed to add the `admin_level` to the extra tags for boundaries and b) the websites then needs to be changed to use the admin_level from the extratags instead of making a guess from the ranks.

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