[CI] DataStreamLifecycleDownsampleDisruptionIT testDataStreamLifecycleDownsampleRollingRestart failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #7710 / openjdk21_checkpart2_java-fips-matrix
• elasticsearch-periodic #7704 / openjdk23_checkpart2_java-matrix

Reproduction Line:

./gradlew ":x-pack:plugin:downsample:internalClusterTest" --tests "org.elasticsearch.xpack.downsample.DataStreamLifecycleDownsampleDisruptionIT.testDataStreamLifecycleDownsampleRollingRestart" -Dtests.seed=77ED6F04F09D631B -Dtests.locale=zh-Hans-HK -Dtests.timezone=Asia/Khandyga -Druntime.java=21 -Dtests.fips.enabled=true

Applicable branches:
9.0

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: safeGet: listener was completed exceptionally

Issue Reasons:

• [9.0] 2 failures in test testDataStreamLifecycleDownsampleRollingRestart (2.6% fail rate in 78 executions)
• [9.0] 2 failures in pipeline elasticsearch-periodic (50.0% fail rate in 4 executions)

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

[elasticsearchmachine]

Pinging @elastic/es-data-management (Team:Data Management)

[nielsbauman]

This just required a backport of #126682 to 9.0.