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https://issues.apache.org/jira/browse/LUCENE-8395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16541501#comment-16541501
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Alan Woodward commented on LUCENE-8395:
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Here is a patch with a test and fix.
> WordDelimiterGraphFilter can incorrectly add holes to a TokenStream
> -------------------------------------------------------------------
>
> Key: LUCENE-8395
> URL: https://issues.apache.org/jira/browse/LUCENE-8395
> Project: Lucene - Core
> Issue Type: New Feature
> Reporter: Alan Woodward
> Assignee: Alan Woodward
> Priority: Major
> Attachments: LUCENE-8395.patch
>
>
> If a token consists entirely of delimiter characters, then
> WordDelimiterGraphFilter will remove the token and insert a hole into the
> TokenStream. However, it does this even if {{preserve_original}} is set,
> which results in an extra gap being added to the stream.
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