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I've only used Lucene via Solr, but it perfectly supports arbitrary document created according to a custom function .
In your case, I would use something like:
recip(rord(created_when),1,1000,500)
As a boost function. I realize this doesn't answer your specific Lucene question, but if you can do it with Solr's QueryHandler, you can definitely do it in the Lucene app!
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