[SOLR-3017] Allow edismax stopword filter factory implementation to be specified

• Type: Improvement
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 4.0-ALPHA
• Fix Version/s: 4.0-ALPHA
• Assignee: Unassigned
• Reporter: Michael Dodsworth
• Created: 09/Jan/12 17:48
• Updated: 10/May/13 10:38
• Resolved: 01/Mar/12 22:48

Description

Currently, the edismax query parser assumes that stopword filtering is being done by StopFilter: the removal of the stop filter is performed by looking for an instance of 'StopFilterFactory' (hard-coded) within the associated field's analysis chain.

We'd like to be able to use our own stop filters whilst keeping the edismax stopword removal goodness. The supplied patch allows the stopword filter factory class to be supplied as a param, "stopwordFilterClassName". If no value is given, the default (StopFilterFactory) is used.

Another option I looked into was to extend StopFilterFactory to create our own filter. Unfortunately, StopFilterFactory's 'create' method returns StopFilter, not TokenStream. StopFilter is also final.

Issue Links

• relates to: SOLR-1553 extended dismax query parser
• relates to: SOLR-2368 Improve extended dismax (edismax) parser