public Task <bool> DeleteAsync(Guid id)
        {
            var content = new TextIndexContent(indexWriter, indexState, id);

            content.Delete();

            return(TryFlushAsync());
        }
        public Task <bool> DeleteAsync(Guid id)
        {
            var content = new TextIndexContent(index, indexState, id);

            content.Delete();

            return(TryCommitAsync());
        }