LocomotiveCMS copy slug to new locale

Program.cs

using MongoDB.Bson;
using MongoDB.Driver;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LocomotiveParser
{
    class Program
    {
        static void Main(string[] args)
        {
            var connectionString = "mongodb://192.168.247.146";
            var mongoClient = new MongoClient(connectionString);
            var database = mongoClient.GetDatabase("locomotive_dev");

            var collection = database.GetCollection<BsonDocument>("locomotive_content_entries");
            var filter = Builders<BsonDocument>.Filter.Exists("_slug.es", false);
            var cursor = collection.Find(filter);

            var totalElements = cursor.ToEnumerable().Count();
            Console.WriteLine("Completing spanish slug for {0} elements", totalElements);

            var updateCommands = new List<UpdateOneModel<BsonDocument>>();
            if (totalElements > 0)
            {
                foreach (var entry in cursor.ToEnumerable())
                {
                    BsonValue entry_id = null;
                    BsonValue entry_slug = null;

                    if (entry.TryGetValue("_id", out entry_id) && entry.TryGetValue("_slug", out entry_slug))
                    {
                        BsonElement slug_value;
                        if (entry_slug.AsBsonDocument.TryGetElement("en", out slug_value))
                        {
                            string slug_en = slug_value.Value.ToString();
                            string id = entry_id.ToString().Replace("{", "").Replace("}", "");

                            var new_slugs = new BsonDocument { { "en", slug_en }, { "es", slug_en } };

                            var builder = Builders<BsonDocument>.Update;
                            var update = builder.Set("_slug", new_slugs);

                            var entryUpdate = new UpdateOneModel<BsonDocument>(new BsonDocument("_id", entry_id), update);
                            updateCommands.Add(entryUpdate);
                        }
                    }
                }
            }

            try
            {
                collection.BulkWrite(updateCommands.AsEnumerable());
            }
            catch (Exception e)
            {
                Console.WriteLine("Error");
            }

            cursor = collection.Find(filter);
            Console.WriteLine("{0} elements without change", cursor.ToEnumerable().Count());
            Console.ReadKey();
        }
    }
}