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https://issues.apache.org/jira/browse/LUCENE-1435?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12644604#action_12644604
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Robert Muir commented on LUCENE-1435:
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One alternative is that the ICU implementation has versioning specifically for
this purpose.
The version information of Collator is a 32-bit integer. If a new version of
ICU has changes affecting the content of collation elements, the version
information will be changed. In that case, to use the new version of ICU
collator will require regenerating any saved or stored sort keys. However,
since ICU 1.8.1. it is possible to build your program so that it uses more than
one version of ICU. Therefore, you could use the current version for the
features you need and use the older version for collation.
> CollationKeyFilter: convert tokens into CollationKeys encoded using
> IndexableBinaryStringTools
> ----------------------------------------------------------------------------------------------
>
> Key: LUCENE-1435
> URL: https://issues.apache.org/jira/browse/LUCENE-1435
> Project: Lucene - Java
> Issue Type: New Feature
> Affects Versions: 2.4
> Reporter: Steven Rowe
> Priority: Minor
> Fix For: 2.9
>
> Attachments: LUCENE-1435.patch
>
>
> Converts each token into its CollationKey using the provided collator, and
> then encodes the CollationKey with IndexableBinaryStringTools, to allow it to
> be stored as an index term.
> This will allow for efficient range searches and Sorts over fields that need
> collation for proper ordering.
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