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https://issues.apache.org/jira/browse/LUCENE-8264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16449944#comment-16449944
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Mark Miller commented on LUCENE-8264:
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bq. Sorry, i don't the discussion makes much sense.
The discussion makes sense, it sounds like you think making some kind of tool
doesn't make sense.
bq. The stuff like norms changes requires reindex, like the inverted index, the
data is stored in a lossy way. Lucene can't do anything about it: its an index.
That's been covered in the discussion - sometimes you can't do anything and
that's why Lucene currently has this limitation.
bq. I am a true -1 to making a tool that will screw up scoring, sorry.
Same old helpful Robert. Type fast and carry a big veto. Happy belated birthday!
> 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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