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https://issues.apache.org/jira/browse/LUCENE-8966?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16923222#comment-16923222
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Jim Ferenczi commented on LUCENE-8966:
--------------------------------------
Here is a patch that breaks unknown words on digits instead of grouping them
with other types.
> KoreanTokenizer should split unknown words on digits
> ----------------------------------------------------
>
> Key: LUCENE-8966
> URL: https://issues.apache.org/jira/browse/LUCENE-8966
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Jim Ferenczi
> Priority: Minor
> Attachments: LUCENE-8966.patch
>
>
> Since https://issues.apache.org/jira/browse/LUCENE-8548 the Korean tokenizer
> groups characters of unknown words if they belong to the same script or an
> inherited one. This is ok for inputs like Мoscow (with a Cyrillic М and the
> rest in Latin) but this rule doesn't work well on digits since they are
> considered common with other scripts. For instance the input "44사이즈" is kept
> as is even though "사이즈" is part of the dictionary. We should restore the
> original behavior and splits any unknown words if a digit is followed by
> another type.
> This issue was first discovered in
> [https://github.com/elastic/elasticsearch/issues/46365]
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