[jira] [Updated] (LUCENE-7536) ASCIIFoldingFilterFactory.getMultiTermComponent can emit two tokens

["Adrien Grand (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/LUCENE-7536?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Adrien Grand updated LUCENE-7536:
---------------------------------
    Attachment: LUCENE-7536.patch

Here is a proposal: the multi-term component only emits the folded token, even when {{preserveOriginal}} is true.

> ASCIIFoldingFilterFactory.getMultiTermComponent can emit two tokens
> -------------------------------------------------------------------
>
>                 Key: LUCENE-7536
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7536
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Adrien Grand
>            Priority: Minor
>         Attachments: LUCENE-7536.patch
>
>
> My understanding is that it is a requirement for multi-term analysis to only normalize tokens, and not eg. remove tokens (stop filter) or add tokens (by tokenizing or adding synonyms). Yet ASCIIFoldingFilterFactory.getMultiTermComponent will return a factory that emits synonyms if preserveOriginal is set to true on the original filter.
> This looks like a bug to me but I'm not entirely sure how to fix it. Should the multi-term analysis component do ascii folding or not if the original factory has preserveOriginal set to true?



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