[Geocoding] [OpenStreetMap] #4886: Add addr:unit support to nominatim

[OpenStreetMap]

#4886: Add addr:unit support to nominatim
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  Reporter:  oddityoverseer  |      Owner:  geocoding@…
      Type:  enhancement     |     Status:  new
  Priority:  minor           |  Milestone:
 Component:  nominatim       |    Version:
Resolution:                  |   Keywords:  addr:unit flat suite
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Comment (by stefanblag):

 This addition is critically needed for the Bulgarian and other maps with
 soviet-era apartment buildings. For example a building's address may be
 "Batova Street 1B, Apartment Block 5, Entrance (Unit) A". The unit cannot
 be concatenated to the building name or street number as it might be
 mistaken for a duplex. In some cases the units might be independent from
 the street number. For now I keep adding addr:unit tags, hoping for the
 search to work someday.

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Ticket URL: <https://trac.openstreetmap.org/ticket/4886#comment:3>
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