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    This is a description of production search engine of Bing.

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      I’m an author on this paper. 2 things:

      1. A copy-paste-with-some-cleanup version of the code that serves production traffic in Bing is available here: https://github.com/BitFunnel/BitFunnel This was mostly done by Dan and Mike.
      2. Bing is actually multiple search indexes. So, BitFunnel serves every production query, but it “only” maintains the “SuperFresh” index, which is to say, the index of documents that need to be updated really frequently.
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      In StrangeLoop 2016, Dan Luu had an awesome talk about BitFunnel and search performance:

      Talk: https://www.youtube.com/watch?v=80LKF2qph6I

      Transcripts: http://bitfunnel.org/strangeloop/