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https://issues.apache.org/jira/browse/LUCENE-9325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17083471#comment-17083471
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Michael Sokolov commented on LUCENE-9325:
-----------------------------------------
+1 for this. It's even possible to alter seeming constants such as
Sort.RELEVANCE and Sort.INDEXORDER; this happened to us since they were passed
around in a sort variable that we later modified for perfectly valid reasons :)
> Sort and SortField are not immutable
> ------------------------------------
>
> Key: LUCENE-9325
> URL: https://issues.apache.org/jira/browse/LUCENE-9325
> Project: Lucene - Core
> Issue Type: Improvement
> Reporter: Alan Woodward
> Assignee: Alan Woodward
> Priority: Major
>
> The `Sort` and `SortField` classes are currently mutable, which makes them
> dangerous to use in multiple threads. In particular, you can set an index
> sort on an IndexWriterConfig and then change its internal sort fields while
> the index is being written to.
> We should make all member fields on these classes final, and in addition we
> should make `Sort` final itself.
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