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https://issues.apache.org/jira/browse/LUCENE-1343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12786946#action_12786946
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Robert Muir commented on LUCENE-1343:
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bq. Robert Muir, Would it make sense to have a Greek filter that strips
diacritics? My thought is that if the letter is Greek then the diacritics would
be removed, but otherwise it would not.
The GreekLowerCaseFilter (incorrectly named) does this also, somewhat. it
removes tone marks... but this might not be what you "want" (depending on what
that is), if you are dealing with polytonic Greek (sorry for my ignorance of
the biblical test you are looking at, but I think it is ancient Greek?)
bq. Similar question for Hebrew, I see value in two filters: one would strip
cantillation and the other, vowel points. Or would it be better to have one
that can do both depending on flags?
This depends on your use case, and then you have dagesh,shin dot, too... These
are all NSMs. But this is going to depend on the user, and I think every person
will need their own, they can use CharFilter or other ways of defining these
tables.
> A replacement for ISOLatin1AccentFilter that does a more thorough job of
> removing diacritical marks or non-spacing modifiers.
> -----------------------------------------------------------------------------------------------------------------------------
>
> Key: LUCENE-1343
> URL: https://issues.apache.org/jira/browse/LUCENE-1343
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Analysis
> Reporter: Robert Haschart
> Priority: Minor
> Attachments: normalizer.jar, UnicodeCharUtil.java,
> UnicodeNormalizationFilter.java, UnicodeNormalizationFilterFactory.java
>
>
> The ISOLatin1AccentFilter takes Unicode characters that have diacritical
> marks and replaces them with a version of that character with the diacritical
> mark removed. For example é becomes e. However another equally valid way of
> representing an accented character in Unicode is to have the unaccented
> character followed by a non-spacing modifier character (like this: é )
> The ISOLatin1AccentFilter doesn't handle the accents in decomposed unicode
> characters at all. Additionally there are some instances where a word will
> contain what looks like an accented character, that is actually considered to
> be a separate unaccented character such as Ł but which to make searching
> easier you want to fold onto the latin1 lookalike version L .
> The UnicodeNormalizationFilter can filter out accents and diacritical marks
> whether they occur as composed characters or decomposed characters, it can
> also handle cases where as described above characters that look like they
> have diacritics (but don't) are to be folded onto the letter that they look
> like ( Ł -> L )
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