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db.collection.find({geoJson 
    : {$near:
        {$geometry:
            {type:"Point", 
            coordinates:[34.7,31.82]}, 
         $maxDistance : 10023 }
        }
       })

db.points.ensureIndex( { <location field> : "2dsphere" } )
// http://docs.mongodb.org/manual/tutorial/build-a-2dsphere-index/