[LUCENE-5274] Teach fast FastVectorHighlighter to highlight "child fields" with parent fields

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Fix Version/s: 4.6
• Component/s: core/other
• Lucene Fields: New
• Assignee: Adrien Grand
• Reporter: Nik Everett
• Created: 10/Oct/13 13:52
• Updated: 28/Aug/22 13:54
• Resolved: 21/Oct/13 18:03

Description

I've been messing around with the FastVectorHighlighter and it looks like I can teach it to highlight matches on "child fields". Like this query:
foo:scissors foo_exact:running
would highlight foo like this:
<em>running</em> with <em>scissors</em>

Where foo is stored WITH_POSITIONS_OFFSETS and foo_plain is an unstored copy of foo a different analyzer and its own WITH_POSITIONS_OFFSETS.

This would make queries that perform weighted matches against different analyzers much more convenient to highlight.

I have working code and test cases but they are hacked into Elasticsearch. I'd love to Lucene-ify if you'll take them.