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https://issues.apache.org/jira/browse/SOLR-16442?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17620361#comment-17620361
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Uwe Schindler commented on SOLR-16442:
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We should also think of updating the startup scripts to pass
{{--enable-preview}} to JVM if exactly Java 19 is detected. Elasticsearch and
Opensearch will / have already done this. Not doing this will print a startup
warning on Java 19 to Java logging.
The main reason to pass {{--enable-preview}} to the JVM is to allow
MMapDirectory V2 to be enabled and memory mapping happening in larger junks for
less overhead and use of kernel resources (see vm.max-map-count sysctl). It
also reduces risk of crushing JDK on bad written plugins or bugs with reopening
IndexSearcher/IndexReader.
See https://github.com/apache/lucene/pull/912 for more details.
> Upgrade to Lucene 9.4.1 (do and document)
> -----------------------------------------
>
> Key: SOLR-16442
> URL: https://issues.apache.org/jira/browse/SOLR-16442
> Project: Solr
> Issue Type: Task
> Reporter: Christine Poerschke
> Assignee: Christine Poerschke
> Priority: Major
> Fix For: main (10.0), 9.2
>
> Time Spent: 2h 20m
> Remaining Estimate: 0h
>
> * Upgrade to Lucene 9.4
> * Document the steps for upgrading e.g. in
> [https://github.com/apache/solr/tree/main/dev-docs]
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