class WellIndex::Core
 include MongoMapper::Document

 key :well_name
 key :surface_loc, Hash
 ensure_index [[:surface_loc, '2dsphere']]
end

class WellIndex::Core
 include Mongoid::Document

 field :well_name, type: String
 field :surface_loc, Array
 index({:surface_loc => '2dsphere'})
end