Easiest way to implement a search engine over a set of URLs

Question

I'm trying to implement a simple search engine over a list of HTML documents. I've build a script that generates the needed list of links. There is no need for crawling any other documents.

So far I've tried Solr / Nutch (I'm still trying to get them working...), but they feel way overkill for such a simple task. I'm looking for something more "plug-and-play"-like.

The environnement is private, so Google Custom Search is not an option, but there is no need for an authentication scheme. The search server would reside on the same server as the documents, and be allowed all access.