[LUCENE-9537] Add Indri Search Engine Functionality to Lucene

• Type: Improvement
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 8.9
• Component/s: core/search
• Labels: patch
• Lucene Fields: New
• Review Patch?: Yes
• Assignee: Unassigned
• Reporter: Cameron VandenBerg
• Created: 22/Sep/20 02:53
• Updated: 28/Aug/22 16:08
• Resolved: 18/Jun/21 20:56

Description

Indri (http://lemurproject.org/indri.php) is an academic search engine developed by The University of Massachusetts and Carnegie Mellon University.  The major difference between Lucene and Indri is that Indri will give a document a "smoothing score" to a document that does not contain the search term, which has improved the search ranking accuracy in our experiments.  I have created an Indri patch, which adds the search code needed to implement the Indri AND logic as well as Indri's implementation of Dirichlet Smoothing.

Issue Links

• relates to: LUCENE-10157 Add Additional Indri Search Engine Functionality to Lucene
• relates to: SOLR-15958 review FilterFeatureScorer delegation logic w.r.t. Scorable
• links to: GitHub Pull Request #2097