[jira] [Updated] (SOLR-9778) Make luceneMatchVersion handling easy/automatic

["David Smiley (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-9778?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

David Smiley updated SOLR-9778:
-------------------------------
    Summary: Make luceneMatchVersion handling easy/automatic  (was: improve luceneMatchVersion handling)

> 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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