Screening of web pages in Nutch indexing for vertical search

Hi, I am a newbie to Nutch but I need to build a small
'vertical' search
engine with Nutch. I tried to read some documents but didnt
find what I
need.

Basically, what I want to know is how to make sure only web
pages with
certain keywords are indexed. For example, for a vertical
search engine for
cars, I only want to index pages with keywords like 'car' or
'automobile',
etc.

Is there a configuration option in Nutch? Is there a plug-in
that I can use
or do I have to write my own plug-in?

Thanks a lot!!
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