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https://issues.apache.org/jira/browse/LUCENE-8740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16929699#comment-16929699
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Chongchen Chen commented on LUCENE-8740:
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It seems that FlattenGraphFilter doesn't work well with StopFilter's result.
The workaround is putting the FlattenGraphFilter before StopFilter.
> AssertionError FlattenGraphFilter
> ---------------------------------
>
> Key: LUCENE-8740
> URL: https://issues.apache.org/jira/browse/LUCENE-8740
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 7.5, 8.0
> Reporter: Markus Jelsma
> Priority: Major
> Fix For: 8.1, master (9.0)
>
> Attachments: LUCENE-8740.patch
>
>
> Our unit tests picked up an unusual AssertionError in FlattenGraphFilter
> which manifests itself only in very specific circumstances involving
> WordDelimiterGraph, StopFilter, FlattenGraphFilter and MinhashFilter.
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