Remove duplicate entry - MongoDB

js

var cursor = db.getCollection('servers').aggregate([
  { $group: {
    _id: { name: "$hostname" },   // replace `name` here twice
    uniqueIds: { $addToSet: "$_id" },
    count: { $sum: 1 } 
  } }, 
  { $match: { 
    count: { $gte: 2 } 
  } },
  { $sort : { count : -1} },
  { $limit : 1000 }
]);
  
ids = cursor.map(function (doc) { 
    return {
    _id: doc._id,   // replace `name` here twice
    uniqueIds: doc.uniqueIds.slice(1),
    count: doc.count
    }});
    
rmv = ids.map(function(doc) {return db.getCollection('servers').remove({"_id": { "$in": doc.uniqueIds }});})