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https://issues.apache.org/jira/browse/LUCENE-5191?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Uwe Schindler resolved LUCENE-5191.
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Resolution: Fixed
> SimpleHTMLEncoder in Highlighter module breaks Unicode outside BMP
> ------------------------------------------------------------------
>
> Key: LUCENE-5191
> URL: https://issues.apache.org/jira/browse/LUCENE-5191
> Project: Lucene - Core
> Issue Type: Bug
> Components: modules/highlighter
> Reporter: Uwe Schindler
> Assignee: Uwe Schindler
> Fix For: 5.0, 4.5
>
> Attachments: LUCENE-5191.patch, LUCENE-5191.patch
>
>
> The highlighter provides a function to escape HTML, which does to much. To
> create valid HTML only ", <, >, & must be escaped, everything else can kept
> unescaped. The escaper unfortunately does also additionally escape everything
> > 127, which is unneeded if your web site has the correct encoding. It also
> produces huge amounts of HTML entities if used with eastern languages.
> This would not be a bugf if the escaping would be correct, but it isn't, it
> escapes like that:
> {{result.append("\&#").append((int)ch).append(";");}}
> So it escapes not (as HTML needs) the unicode codepoint, instead it escapes
> the UTF-16 char, which is incorrect, e.g. for our all-time favourite Deseret:
> U+10400 (deseret capital letter long i) would be escaped as
> {{&\#55297;&\#56320;}} and not as {{&\#66560;}}.
> So we should remove the stupid encoding of chars > 127 which is simply
> useless :-)
> See also: https://github.com/elasticsearch/elasticsearch/issues/3587
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