public Dictionary<long, double?> Recommend(int user, List<int> userFilms)
        {
            recommendations.Clear();
            List<int> list = new List<int>();
            foreach(var film in userFilms)
            {
                double? x;
                List<int> pomList = new List<int>();
                ratings.TryGetValue(film, out x);
                var searchResponse = client.Search<Ratings>(s => s.Query(q => q.Match(m => m.Field(f => f.MovieId).Query(film.ToString())) && q.Range(r => r.Field(fi => fi.Rating).GreaterThanOrEquals(x))).Size(size)
                    .Aggregations(a => a
                        .Terms("recommend", ts => ts
                            .Field(o => o.MovieId).Size(size)
                                .Aggregations(aa => aa
                                    .Terms("userId", sa => sa
                                        .Field(o => o.UserId)
                                    )
                                )
                            )
                        )
                    );

                foreach(var doc in searchResponse.Documents)
                    pomList.Add(doc.UserId);

                if (pomList.Contains(user))
                    pomList.ForEach(e => list.Add(e));
            }

            list.Distinct<int>();

            foreach (var rating in ratings)
            {
                var searchResponse = client.Search<Ratings>(s => s.Query(q => q.Match(m => m.Field(f => f.MovieId).Query(rating.Key.ToString())) && q.Range(r => r.Field(fi => fi.Rating).GreaterThanOrEquals(rating.Value))).Size(size));
                foreach (var doc in searchResponse.Documents)
                {
                    if (list.Contains(doc.UserId) && !recommendations.ContainsKey(rating.Key) && !userFilms.Contains(doc.MovieId))
                        recommendations.Add(doc.MovieId, rating.Value);
                }
            }
            recommendations = GetTop10(recommendations);
            return recommendations;
        }