[CI] DataStreamIndexSettingsProviderTests testGetAdditionalIndexSettings failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-intake #29726 / part1
• elasticsearch-periodic-platform-support #10993 / rocky-9_platform-support-unix

Reproduction Line:

./gradlew ":modules:data-streams:test" --tests "org.elasticsearch.datastreams.DataStreamIndexSettingsProviderTests.testGetAdditionalIndexSettings" -Dtests.seed=9AA0046558333FD0 -Dtests.locale=ar-TD -Dtests.timezone=America/Costa_Rica -Druntime.java=25

Applicable branches:
9.2

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: 
Expected: iterable with items ["field3", "field4", "field5", "field6"] in any order
     but: no item matches: "field3", "field4", "field5", "field6" in []

Issue Reasons:

• [9.2] 2 failures in test testGetAdditionalIndexSettings (0.9% fail rate in 225 executions)

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

[elasticsearchmachine]

This has been muted on branch main

Mute Reasons:

• [main] 3 failures in test testGetAdditionalIndexSettings (1.2% fail rate in 242 executions)

Build Scans:

• elasticsearch-periodic-platform-support #10966 / sles-15_platform-support-unix
• elasticsearch-pull-request #96706 / part-1
• elasticsearch-intake #29484 / part1

[elasticsearchmachine]

Pinging @elastic/es-storage-engine (Team:StorageEngine)

[elasticsearchmachine]

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

[elasticsearchmachine]

This has been muted on branch 9.2

Mute Reasons:

• [9.2] 2 failures in test testGetAdditionalIndexSettings (0.9% fail rate in 225 executions)

Build Scans:

• elasticsearch-intake #29726 / part1
• elasticsearch-periodic-platform-support #10993 / rocky-9_platform-support-unix

[nielsbauman]

@felixbarny could this be related to your work in #135673? Also see #135884 for a similar test failure.