Hello.
As Gabriele said before, you should specify your url´s list that you´ll use for crawling/fetching. You can enter an specific url or a domain url pointing to, for example, a particular html pdf file. Of course, you can put several urls as a list, not only one. In any case, be careful with the crawl-urlfilter.txt config file: if you have configured it before maybe the pattern that you decided wont´t be aplicable for your new url list and then you won´t index anything. It´s a very common mistake.
