[LUCENE-10523] facilitate UnifiedHighlighter extension w.r.t. FieldHighlighter

• Type: Wish
• Status: Closed
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 10.0 (main), 9.3
• Lucene Fields: New
• Assignee: Christine Poerschke
• Reporter: Christine Poerschke
• Created: 19/Apr/22 13:27
• Updated: 28/Aug/22 16:39
• Resolved: 13/Jul/22 17:46

Description

If the UnifiedHighlighter had a protected newFieldHighlighter method then less getFieldHighlighter code would need to be duplicated if one wanted to use a custom FieldHighlighter.

Proposed change: https://github.com/apache/lucene/pull/821

A possible usage scenario:

• e.g. via Solr's HTMLStripFieldUpdateProcessorFactory any HTML markup could be stripped at document ingestion time but this may not suit all use cases
• e.g. via Solr's hl.encoder=html parameter any HTML markup could be escaped at document search time when returning highlighting snippets but this may not suit all use cases
• extension illustration: https://github.com/apache/solr/pull/811
  • i.e. at document search time remove any HTML markup prior to highlight snippet extraction

Issue Links

• links to: GitHub Pull Request #811
• links to: GitHub Pull Request #821
• links to: GitHub Pull Request #832