The Difference Between Indexed and Ranked
It seems there may be a little confusion over the terms Indexed and Ranked.
If a page/post is indexed then it is showing up in the SERPs (Search Engine Results Pages), and the search engines knows that it exists.
If a page/post is ranked, it means that your page/post is listed(Ranked) for a particulr keyword contained with your content.
If an article is indexed doesn't mean to say that it is going to immediatly ranked.
Hope this clears up any confusion.