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https://issues.apache.org/jira/browse/LUCENE-2015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12771592#action_12771592
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Uwe Schindler commented on LUCENE-2015:
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I would leave ISOLatin1AccentFilter as it is. No version logic for already
deprecated classes, they are deprecated, so no support any more. Normally we
would have removed it in 3.0, it is really only be there to support old
indexes, so no new features. If until now, nobody complained, we do not need to
care. Maybe the modifications were so special, that only some of the term in
such indexes were affected and nobody realized that difference.
> ASCIIFoldingFilter: expose folding logic + small improvements to
> ISOLatin1AccentFilter
> --------------------------------------------------------------------------------------
>
> Key: LUCENE-2015
> URL: https://issues.apache.org/jira/browse/LUCENE-2015
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Analysis
> Reporter: Cédrik LIME
> Priority: Minor
> Attachments: ASCIIFoldingFilter-no_formatting.patch, Filters.patch,
> ISOLatin1AccentFilter.patch
>
>
> This patch adds a couple of non-ascii chars to ISOLatin1AccentFilter (namely:
> left & right single quotation marks, en dash, em dash) which we very
> frequently encounter in our projects. I know that this class is now
> deprecated; this improvement is for legacy code that hasn't migrated yet.
> It also enables easy access to the ascii folding technique use in
> ASCIIFoldingFilter for potential re-use in non-Lucene-related code.
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