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https://issues.apache.org/jira/browse/LUCENE-9913?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Adrien Grand resolved LUCENE-9913.
----------------------------------
    Resolution: Fixed

Argh, it is a bug in bulk merges due to numChunks not being propagated on the 
optimized merge code path. I'm glad this test caught it. I just pushed a fix.

I'm not setting a fixVersion since this bug wasn't released.

> TestCompressingTermVectorsFormat.testMergeStability can fail assertion
> ----------------------------------------------------------------------
>
>                 Key: LUCENE-9913
>                 URL: https://issues.apache.org/jira/browse/LUCENE-9913
>             Project: Lucene - Core
>          Issue Type: Test
>            Reporter: Julie Tibshirani
>            Priority: Major
>
> This reproduces for me on {{main}}:
> {code:java}
> ./gradlew test --tests TestCompressingTermVectorsFormat.testMergeStability \
>   -Dtests.seed=502C0E17C8769082 -Dtests.nightly=true \
>   -Dtests.slow=true -Dtests.badapples=true -Dtests.locale=gd-GB \
>   -Dtests.timezone=Africa/Accra -Dtests.asserts=true \
>   -Dtests.file.encoding=UTF-8
> {code}
> Failure excerpt:
> {code:java}
>  >     java.lang.AssertionError: expected:<{tvd=33526, fnm=698, nvm=283, 
> tvm=164, tmd=826, fdm=158, pos=10508, fdt=1121, tvx=339, doc=13302, 
> tim=22354, tip=101, fdx=202, nvd=18983}> but was:<{tvd=33526, fnm=698, 
> nvm=283, tvm=163, tmd=826, fdm=157, pos=10508, fdt=1121, tvx=339, doc=13302, 
> tim=22354, tip=101, fdx=202, nvd=18983}>
>    >         at 
> __randomizedtesting.SeedInfo.seed([502C0E17C8769082:24604838C59C9234]:0)
>    >         at org.junit.Assert.fail(Assert.java:89)
> {code}



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