[CI] CountDistinctTests class failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic-platform-support #9465 / rhel-8_platform-support-unix
• elasticsearch-pull-request #80868 / part-3

Reproduction Line:

./gradlew ":x-pack:plugin:esql:test" --tests "org.elasticsearch.xpack.esql.expression.function.aggregate.CountDistinctTests.testGroupingAggregate {TestCase=<short alpha TEXTs> #3}" -Dtests.seed=E39FA71E590303FF -Dtests.locale=sd-Deva-IN -Dtests.timezone=America/St_Lucia -Druntime.java=24

Applicable branches:
main

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: 
Expected: <382L>
     but: was <381L>

Issue Reasons:

• [main] 2 failures in class org.elasticsearch.xpack.esql.expression.function.aggregate.CountDistinctTests (0.2% fail rate in 920 executions)

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

[elasticsearchmachine]

Pinging @elastic/es-analytical-engine (Team:Analytics)

[nik9000]

Doesn't reproduce locally. Trying harder.

[nik9000]

3 failures in the past week. The failures don't looks particularly related though. Doesn't reproduce locally. Will mark as low and have another look later.