Post indexer (not indexing everything?)

I'm getting my MultiSite up and running, so for some of my blogs (testing) I have dummy content I've imported from an .xml file. After rebuilding the Index I noticed those posts were not add to the index. Only the initial "Hello World!" post was indexed.

Am I missing something here? And after the Post Indexer plugin is installed and activated, I shouldn't need to keep rebuilding the index in order to reflect newer posts, correct?

Thank you for your time.
Rafael