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https://issues.apache.org/jira/browse/LUCENE-9325?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17116679#comment-17116679
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Michael McCandless commented on LUCENE-9325:
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+1, clearly trappy today, and we (Amazon product search) fell into the trap and
were very confused!!
> 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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