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https://issues.apache.org/jira/browse/LUCENE-2019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12772121#action_12772121
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Robert Muir commented on LUCENE-2019:
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Steven, the only reason I might disagree is that a Lucene Index is supposed to
be portable across different languages other than Lucene Java.
in my opinion, if you are to store process-internal codepoints as abstract
characters in terms, then you should not claim that Lucene indexes are in any
Unicode format,
because then they violate the standard.
By *not* storing them in terms, then you are free to use them as delimiters, or
other purposes. right now U+FFFF is used as a delimiter, but who knows, maybe
someday you might need more?
> 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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