I have a class which has an indexed GeoJsonPoint<GeoJson2DCoordinates>, using $near works perfectly well, but when I do the following:

IMongoQuery query = Query<Player>.EQ(p => p.RandomGeoIdentifier, RandomID);
return players.Find(query).SetLimit(1).Size() == 0;

It does a full table scan without using the index.

Adding a hint, causes the query to scan 1 object if exists.
return players.Find(query).SetHint("Random Geo ID").SetLimit(1).Size() == 0;

I believe this is a bug and Mongo should use this index by default.