Alan Woodward commented on LUCENE-8395:

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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