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https://issues.apache.org/jira/browse/LUCENE-8264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16449759#comment-16449759
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Uwe Schindler commented on LUCENE-8264:
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I have no problem on making that tool not public. This is how I earn my money
since a few months. Bringing stone-aged indexes up-to date (adding docvalues).
Those people know that's wrong and scoring is not an issue for them in most
cases. If it is we are working on reindexing, but sometimes that's really
impossible. All those people were Lucene-only customers. It's cool, because
people back in 2.x/3.x days were already using Lucene as their only storage,
unfortunately not everything also stored, so some stuff is "not easy" to be
reindexed in a fast way (like extracting all text again from PDF files).
> Allow an option to rewrite all segments
> ---------------------------------------
>
> Key: LUCENE-8264
> URL: https://issues.apache.org/jira/browse/LUCENE-8264
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Erick Erickson
> Assignee: Erick Erickson
> Priority: Major
>
> For the background, see SOLR-12259.
> There are several use-cases that would be much easier, especially during
> upgrades, if we could specify that all segments get rewritten.
> One example: Upgrading 5x->6x->7x. When segments are merged, they're
> rewritten into the current format. However, there's no guarantee that a
> particular segment _ever_ gets merged so the 6x-7x upgrade won't necessarily
> be successful.
> How many merge policies support this is an open question. I propose to start
> with TMP and raise other JIRAs as necessary for other merge policies.
> So far the usual response has been "re-index from scratch", but that's
> increasingly difficult as systems get larger.
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