[Tile-serving] [openstreetmap/osm2pgsql] [EXPERIMENTAL] Reduced way node index (#1058)

[Paul Norman]

> This may be because I created the indexes on top of an existing database. It may also be that the vacuum is always necessary.

`VACUUM ANALYZE` should be run after osm2pgsql finishes creating the table and builds the indexes so all the stats are up to date

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