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Given that StackOverflow has moved over to Lucene.NET for search, the original question that I asked on this matter now has a completely different answer.

Specifically, some of the things I'd like to know are:

  • How are the indexes arranged?
  • What is the structure of the documents?
  • Was a custom scorer written to somehow weigh results differently based on vote data? If so, how was that scorer implemented?
  • What kind of boosts are applied and on what level?
  • Custom analyzers or no?
  • Anything else that might be relevant.
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closed as too localized by casperOne Feb 27 '13 at 3:42

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I may answer this a bit later on, I'm not sure in how much detail - since there's quite a bit of domain knowledge and explanation required to understand why certain aspects are the way they are. Also, we're currently in flux at the moment, moving to a parser for our advanced terms is on my todo. –  Nick Craver Feb 11 '11 at 0:46
    
@Nick Craver: Well, anytime you want to get around to it =P –  casperOne May 1 '11 at 20:04
    
Update status: it's not! –  Nick Craver Feb 27 '13 at 3:15
    
@nickcraver might change to ask about elastic search, as many of the concepts are carried over. When I'm at a proper computer I'll update. –  casperOne Feb 27 '13 at 3:43

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