At Lucene/Solr Revolution 2015 Michael Nilsson and Diego Ceccarelli from Bloomberg gave a presentation on how Bloomberg uses search and how they improved document ranking in Solr. They covered how machine learning greatly helps in a ranking project. They also talk about their Solr plugin for learning to rank and give a short code walk-through as well as an in depth explanation of how it works.
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Learning to Rank in Solr
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solr plug-inDataConventionRevolutionenterprise searchOpen SourcesolrtuningApache Solrlucenemachine learningLucene/Solrbig datasignallucidworkssolr rankrelevancySolr LuceneapacheText Searchsearchsolr conventionSoftwarelucid workstraining setbloombergfeaturefusionApache Lucenesolr pluginlearning to rankpipelinesrelevancerelevant