In http://docs.mongodb.org/manual/core/geospatial-indexes/

the Haystack Indexes example has these documents

{ _id : 100,

{ long : 126.9, lat : 35.2 }

, type : "restaurant"}
{ _id : 200,

{ long : 127.5, lat : 36.1 }

, type : "restaurant"}
{ _id : 300,

{ long : 128.0, lat : 36.7 }

, type : "national park"}

Are we missing the field name "pos"?