Hey folks, I'm giving a talk at ApacheCon in two weeks about how domain knowledge and/or knowledge of your user base can be used to boost/bias the scores of documents in Solr search results. Simple examples being things like: using function queries to boost by numeric fields like date or popularity; or customizing the tf and lengthNorm functions in your Similarity based on what "good" documents look like.

  http://www.apachecon.eu/schedule/presentation/16/

I would love to be able to highlight some examples beyond things i've personally worked on, so I wanted to reach out the the entire solr-user list to see if anyone had interesting examples they'd like to share about ways they have tweaked the scoring of documents scores based on knowledge of thier users/documents.

Most of the "classes" of customizations i can think of involve...

 * Customized Similarity
 * Boost queries or functions
 * ExternalFiledField
 * QueryElevationComponent

...but don't be shy about sharing a technique you've used that didn't involve any of those things.

You can feel free to respond to this message publicly with as much/little details you're willing to share about the application, users, customizations you used. Or if you'd like to share an interesting use case anonymously (ie: w/o divulging your name or company) you can send it to me privately.

Thanks.

-Hoss

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