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https://issues.apache.org/jira/browse/SOLR-9778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15671217#comment-15671217
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David Smiley commented on SOLR-9778:
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bq. Maybe put a new file into conf?
If it were initialized at the time a configSet is first used, then I think that
might be okay. It could interfere with configSet sharing and read-only
configSets though. My main concern with conf for this purpose is semantics; I
don't view this as configuration; it's metadata for the index. You shouldn't
go in and change this file; you would instead edit the config to override it.
But few would have a desire to do that, I think.
> Make luceneMatchVersion handling easy/automatic
> -----------------------------------------------
>
> Key: SOLR-9778
> URL: https://issues.apache.org/jira/browse/SOLR-9778
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Reporter: David Smiley
>
> I was thinking about luceneMatchVersion and how it's annoying to both explain
> and get right, and maintain. I think there's a way in Solr we can do this
> way better:
> When an index is initialized, record the luceneMatchVersion in effect into a
> file in the data directory, like luceneMatchVersion.txt. It's a file that
> will never be modified.
> The luceneMatchVersion in effect is the first of these that are specified:
> * {{<luceneMatchVersion>}} in solrconfig.xml
> * data/luceneMatchVersion.txt
> * {{org.apache.lucene.util.Version.LATEST}}
> With this approach, we can eliminate putting {{<luceneMatchVersion>}} into
> solrconfig.xml by default. Most users will have no need to bother setting
> it, even during an upgrade of either an existing index, or when they
> re-index. Of course there are cases where the user knows what they are doing
> and insists on a different luceneMatchVersion, and they can specify that
> still.
> Perhaps instead of a new file (data/luceneMatchVersion.txt), it might go into
> core.properties. I dunno.
> _(disclaimer: as I write this, I have no plans to work on this at the moment)_
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