PersonRepo.cs

   var tagFilter = ((IEnumerable<dynamic>)fr["$and"]).FirstOrDefault(p => p.tags != null);

                if (tagFilter != null)
                {
                    var tags = ((IEnumerable<int>)tagFilter.tags["$in"]).Select(p=>(int)p);

                    q = q.FilterByTags(tags);
                }