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https://issues.apache.org/jira/browse/LUCENE-2019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12772214#action_12772214
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Robert Muir commented on LUCENE-2019:
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bq. Robert, you are a proponent of the (ICU)CollationKeyFilter functionality,
which uses IndexableBinaryStringTools to store arbitrary binary data in a
Lucene index.
I'm actually only a fan of the idea of using unicode collation for searching
and sorting.
as a default, binary comparison for most languages is absolute madness.
I'm not so much a fan of how it encodes this data binary data into what people
expect to be a character field, but I understand the limitations and don't
blame the implementation :)
and this implementation never uses any of the characters in question, although
thats not really relevant.
> map unicode process-internal codepoints to replacement character
> ----------------------------------------------------------------
>
> Key: LUCENE-2019
> URL: https://issues.apache.org/jira/browse/LUCENE-2019
> Project: Lucene - Java
> Issue Type: Improvement
> Components: Index
> Reporter: Robert Muir
> Priority: Minor
> Attachments: LUCENE-2019.patch
>
>
> A spinoff from LUCENE-2016.
> There are several process-internal codepoints in unicode, we should not store
> these in the index.
> Instead they should be mapped to replacement character (U+FFFD), so they can
> be used process-internally.
> An example of this is how Lucene Java currently uses U+FFFF
> process-internally, it can't be in the index or will cause problems.
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