MongoDB.Collection.CreateIndex C# (CSharp) Method

        public string CreateIndex(Index index, bool unique = false)
        {
            var indexName = IndexName(index);
              var doc = new Doc { {"name", indexName},
                          {"ns", FullName},
                          {"key", index.ToDoc()},
                          {"unique", unique} };
              Database.GetCollection("system.indexes").Insert(doc);
              return indexName;
        }