// Create two 2d indexes on the same field db.data.createIndex({ coordinates: "2d" }) db.data.createIndex({ coordinates: "2d" , active: 1 }) // Hide one of the indexes db.data.hideIndex({ coordinates: "2d" })  // Try to use $geoNear in an aggregation pipeline: db.data.aggregate([   {     '$geoNear' : {       near: [ 39.7957833, 64.4077002 ],       distanceField: 'distance' ,       maxDistance: 20000     }   } ]) > MongoServerError[IndexNotFound]: There is more than one 2d index on admin.data; unsure which to use for $geoNear