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https://issues.apache.org/jira/browse/LUCENE-8081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16280579#comment-16280579
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Michael McCandless commented on LUCENE-8081:
--------------------------------------------

+1

Maybe expand the javadoc a bit to state that this means the thread calling 
{{refresh}} will be the only thread writing new segments to disk, unless 
flushing falls behind?

> Allow IndexWriter to opt out of flushing on indexing threads
> ------------------------------------------------------------
>
>                 Key: LUCENE-8081
>                 URL: https://issues.apache.org/jira/browse/LUCENE-8081
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Simon Willnauer
>         Attachments: LUCENE-8081.patch
>
>
> Today indexing / updating threads always help out flushing. Experts might 
> want indexing threads to only help flushing if flushes are falling behind. 
> Maybe we can allow an expert flag in IWC to opt out of this behavior.



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