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https://issues.apache.org/jira/browse/LUCENE-7803?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Manuel Gellfart updated LUCENE-7803:
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Priority: Minor (was: Major)
> Problem using FunctionScoreQuery and Highlighting
> -------------------------------------------------
>
> Key: LUCENE-7803
> URL: https://issues.apache.org/jira/browse/LUCENE-7803
> Project: Lucene - Core
> Issue Type: Bug
> Components: core/query/scoring, modules/highlighter
> Affects Versions: 6.5
> Reporter: Manuel Gellfart
> Priority: Minor
>
> Hey,
> I just updated my Lucene to 6.5.0 and tried to get rid of the now deprecated
> index-time field boosts.
> So I did the suggested fix in the deprecation message and added
> FloatDocValues to each Document holding the Boosts for each indexed field.
> In my current Search Implementation there is one BooleanQuery per Field
> containing three BoostQueries. To apply the field boosts from my DocValues I
> wrapped each BooleanQuery inside a FunctionScoreQuery like this:
> {code:WrappedBooleanQueries.java|borderStyle=solid}
> BooleanQuery booleanQuery;
> ...
> new FunctionScoreQuery(booleanQuery,
> DoubleValuesSource.fromFloatField(fieldName));
> {code}
> So far it works as expected but I realized that my Highlighting is not
> working anymore.
> For Highlighting I use the following Snippet:
> {code:title=MyHighlighting.java|borderStyle=solid}
> public static String[] getFragmentsWithHighlightedTerms(Analyzer
> analyzer, Query query, String fieldName, String fieldContents) {
> QueryScorer scorer = new QueryScorer(query);
> Fragmenter fragmenter = new SimpleFragmenter(80);
> Highlighter highlighter = new Highlighter(new EscapeHtmlFormatter(),
> scorer);
> highlighter.setTextFragmenter(fragmenter);
> highlighter.setMaxDocCharsToAnalyze(Integer.MAX_VALUE);
> TextFragment[] fragments;
> try {
> TokenStream tokenStream = analyzer.tokenStream(fieldName,
> fieldContents);
> fragments = highlighter.getBestTextFragments(tokenStream,
> fieldContents, true, 1);
> } catch (InvalidTokenOffsetsException e) {
> throw WrappedException.wrap(e);
> }
> return formatFragments(fragments);
> }
> }
> {code}
> When I remove the FunctionScorerQuery wrapped around my BooleanQueries the
> Highlighting is perfectly fine again. Am I missing something here or is this
> a bug?
> PS: This is my first post here. I hope I did everything right ;)
> Cheers
> Manu
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