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https://issues.apache.org/jira/browse/LUCENE-1689?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12778536#action_12778536
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Robert Muir commented on LUCENE-1689:
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bq. Then thats what I am saying we should be documenting.
+1 I think it should be in the release notes that if you upgrade Java version
to either 1.5 or 1.7, you should reindex because Unicode versions change.
Because of this, character properties change and some tokenizers, etc will emit
different results.
This is really only somewhat related to this issue, but thats what my email
thread on java-dev was all about.
> supplementary character handling
> --------------------------------
>
> Key: LUCENE-1689
> URL: https://issues.apache.org/jira/browse/LUCENE-1689
> Project: Lucene - Java
> Issue Type: Improvement
> Reporter: Robert Muir
> Priority: Minor
> Fix For: 3.1
>
> Attachments: LUCENE-1689.patch, LUCENE-1689.patch, LUCENE-1689.patch,
> LUCENE-1689_lowercase_example.txt, testCurrentBehavior.txt
>
>
> for Java 5. Java 5 is based on unicode 4, which means variable-width encoding.
> supplementary character support should be fixed for code that works with
> char/char[]
> For example:
> StandardAnalyzer, SimpleAnalyzer, StopAnalyzer, etc should at least be
> changed so they don't actually remove suppl characters, or modified to look
> for surrogates and behave correctly.
> LowercaseFilter should be modified to lowercase suppl. characters correctly.
> CharTokenizer should either be deprecated or changed so that isTokenChar()
> and normalize() use int.
> in all of these cases code should remain optimized for the BMP case, and
> suppl characters should be the exception, but still work.
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