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https://issues.apache.org/jira/browse/LUCENE-8723?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16929712#comment-16929712
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Chongchen Chen commented on LUCENE-8723:
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The workaround is putting the FlattenGraphFilter before StopFilter.
> Bad interaction bewteen WordDelimiterGraphFilter, StopFilter and
> FlattenGraphFilter
> -----------------------------------------------------------------------------------
>
> Key: LUCENE-8723
> URL: https://issues.apache.org/jira/browse/LUCENE-8723
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/analysis
> Affects Versions: 7.7.1, 8.0
> Reporter: Nicolás Lichtmaier
> Priority: Major
>
> I was debugging an issue (missing tokens after analysis) and when I enabled
> Java assertions I uncovered a bug when using WordDelimiterGraphFilter +
> StopFilter + FlattenGraphFilter.
> I could reproduce the issue in a small piece of code. This code gives an
> assertion failure when assertions are enabled (-ea java option):
> {code:java}
> Builder builder = CustomAnalyzer.builder();
> builder.withTokenizer(StandardTokenizerFactory.class);
> builder.addTokenFilter(WordDelimiterGraphFilterFactory.class,
> "preserveOriginal", "1");
> builder.addTokenFilter(StopFilterFactory.class);
> builder.addTokenFilter(FlattenGraphFilterFactory.class);
> Analyzer analyzer = builder.build();
>
> TokenStream ts = analyzer.tokenStream("*", new StringReader("x7in"));
> ts.reset();
> while(ts.incrementToken())
> ;
> {code}
> This gives:
> {code}
> Exception in thread "main" java.lang.AssertionError: 2
> at
> org.apache.lucene.analysis.core.FlattenGraphFilter.releaseBufferedToken(FlattenGraphFilter.java:195)
> at
> org.apache.lucene.analysis.core.FlattenGraphFilter.incrementToken(FlattenGraphFilter.java:258)
> at com.wolfram.textsearch.AnalyzerError.main(AnalyzerError.java:32)
> {code}
> Maybe removing stop words after WordDelimiterGraphFilter is wrong, I don't
> know. However is the only way to process stop-words generated by that filter.
> In any case, it should not eat tokens or produce assertions.
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