[CI] SearchWithRejectionsIT testOpenContextsAfterRejections failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic-platform-support #11430 / rhel-8_platform-support-unix
• elasticsearch-periodic-platform-support #11430 / debian-13_platform-support-unix
• elasticsearch-pull-request #104642 / part-1
• elasticsearch-periodic #11428 / adoptopenjdk17_checkpart1_java-matrix

Reproduction Line:

./gradlew ":server:internalClusterTest" --tests "org.elasticsearch.search.SearchWithRejectionsIT.testOpenContextsAfterRejections" -Dtests.seed=69684D0B8A9C85D0 -Dtests.locale=sv-AX -Dtests.timezone=Europe/Oslo -Druntime.java=25

Applicable branches:
8.19

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: 
Expected: <0L>
     but: was <2L>

Issue Reasons:

• [8.19] 2 consecutive failures in test testOpenContextsAfterRejections
• [8.19] 4 failures in test testOpenContextsAfterRejections (1.4% fail rate in 280 executions)

Note:
This issue was created using new test triage automation. Please report issues or feedback to es-delivery.

[elasticsearchmachine]

Pinging @elastic/es-core-infra (Team:Core/Infra)

[jdconrad]

SearchWithRejectionsIT > classMethod FAILED java.lang.AssertionError: java.lang.IllegalStateException: Attempted to close with partial reduce in-flight at __randomizedtesting.SeedInfo.seed([B576858AD794CCB8]:0) at org.elasticsearch.core.Releasables.closeExpectNoException(Releasables.java:74)

[elasticsearchmachine]

Pinging @elastic/es-search-foundations (Team:Search Foundations)

[benchaplin]

I didn't backport #136889 to 8.19 - doing so should solve this.