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https://issues.apache.org/jira/browse/LUCENE-2015?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12771578#action_12771578
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Robert Muir commented on LUCENE-2015:
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bq. ISOLatin1AccentFilter was already modified in Lucene 2.4: see LUCENE-1351
that's interesting, so if someone has a < Lucene 2.4 index built with this
filter, its currently not compatible...
I guess no one has complained but there could be some conditional logic based
on Version to support those indexes...
> 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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