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https://issues.apache.org/jira/browse/LUCENE-4564?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Shai Erera resolved LUCENE-4564.
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Resolution: Won't Fix
The facet module has been rewritten twice during 4.x, requiring an effective
rewrite on the application already. Therefore I think it's fair to assume that
this issue is no longer relevant. I'm closing it and we can reopen if needed.
> Add taxonomy index upgrade utility
> ----------------------------------
>
> Key: LUCENE-4564
> URL: https://issues.apache.org/jira/browse/LUCENE-4564
> Project: Lucene - Core
> Issue Type: New Feature
> Components: modules/facet
> Reporter: Shai Erera
> Assignee: Shai Erera
> Priority: Blocker
> Fix For: Trunk
>
>
> Currently there's no way for an app to upgrade a taxonomy index to the newest
> index format. The problem is, that unlike search indexes which may merge
> segments often, the taxonomy index is not likely to do many merges. At some
> point, most taxonomies become fixed (i.e. new categories are not/rarely
> added), and therefore it could be that some old segments will never get
> merged.
> When we'll release Lucene 5.0, support for 3x indexes will be removed, and so
> taxonomies that were created w/ 3x won't be read anymore.
> While one can use IndexUpgrader (I think) to upgrade the taxonomy index, it
> may not be so trivial for users to realize that, as it may not be so evident
> from DirTaxoWriter/Reader API that there's a regular Lucene index behind the
> scenes.
> A tool, like TaxonomyUpgraderTool, even if simple and using IndexUpgrader,
> may make it more convenient for user to upgrade their taxonomy index.
> Opening as a placeholder for 5.0. Also marking as blocker, so we don't forget
> about it before the release.
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