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https://issues.apache.org/jira/browse/LUCENE-2019?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12772138#action_12772138
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Yonik Seeley commented on LUCENE-2019:
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Here's a process-internal use-case (as I understand the meaning):
User hands me two tokens. I catenate and separate them with an internal-use 
char, then index.
Later, I get this term somehow from lucene, split on my internal-use char and 
hand back to the user.
If lucene converts internal-use chars, this becomes impossible.

What's the use-case for handing lucene internal-use characters and not wanting 
it preserved?  Couldn't you always use your internal-use characters, and then 
convert or remove them before handing to lucene?

> 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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