[SOLR-3085] New edismax param mm.autoRelax to aid in fixing the dismax/edismax stopwords mm issue

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 6.0
• Component/s: query parsers
• Labels: MinimumShouldMatch dismax edismax stopwords
• Assignee: Jan Høydahl
• Reporter: Jan Høydahl
• Created: 01/Feb/12 14:14
• Updated: 09/May/16 18:55
• Resolved: 02/Aug/15 22:42

Description

As discussed here http://search-lucene.com/m/Wr7iz1a95jx and here http://search-lucene.com/m/Yne042qEyCq1 and here http://search-lucene.com/m/RfAp82nSsla DisMax has an issue with stopwords if not all fields used in QF have exactly same stopword lists.

Typical solution is to not use stopwords or harmonize stopword lists across all fields in your QF, or relax the MM to a lower percentag. Sometimes these are not acceptable workarounds, and we should find a better solution.

Issue Links

• is duplicated by: SOLR-6602 dismax query does not match with additional field in qf
• is part of: SOLR-2368 Improve extended dismax (edismax) parser
• relates to: SOLR-3636 edismax, synonyms and mm=100%