func (si SearchIndex) UpdateFeed(feed content.Feed) { si.logger.Infof("Updating article search index for feed '%s'\n", feed) newArticleLinks := map[string]bool{} for _, a := range feed.NewArticles() { newArticleLinks[a.Data().Link] = true } var articles []content.Article for _, a := range feed.ParsedArticles() { if newArticleLinks[a.Data().Link] { articles = append(articles, a) } } si.batchIndex(articles) }