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https://issues.apache.org/jira/browse/LUCENE-2019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12771623#action_12771623
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Robert Muir commented on LUCENE-2019:
-------------------------------------
I think this code won't be so intrusive or hairy.
Here is the list in surrogate pair representation.
Note that for the > BMP points, the trail surrogate is always U+DFFE or U+DFFF
BMP points:
{noformat}
\uFDD0-\uFDEF
\uFFFE
\uFFFF <-- already handled
{noformat}
> BMP points:
{noformat}
\uD83F\uDFFE
\uD83F\uDFFF
\uD87F\uDFFE
\uD87F\uDFFF
\uD8BF\uDFFE
\uD8BF\uDFFF
\uD8FF\uDFFE
\uD8FF\uDFFF
\uD93F\uDFFE
\uD93F\uDFFF
\uD97F\uDFFE
\uD97F\uDFFF
\uD9BF\uDFFE
\uD9BF\uDFFF
\uD9FF\uDFFE
\uD9FF\uDFFF
\uDA3F\uDFFE
\uDA3F\uDFFF
\uDA7F\uDFFE
\uDA7F\uDFFF
\uDABF\uDFFE
\uDABF\uDFFF
\uDAFF\uDFFE
\uDAFF\uDFFF
\uDB3F\uDFFE
\uDB3F\uDFFF
\uDB7F\uDFFE
\uDB7F\uDFFF
\uDBBF\uDFFE
\uDBBF\uDFFF
\uDBFF\uDFFE
\uDBFF\uDFFF
{noformat}
> 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
>
> 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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