[CI] FileSettingsServiceIT testSymlinkUpdateTriggerReload failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic-platform-support #8478 / windows-2025_checkpart1_platform-support-windows
• elasticsearch-periodic-platform-support #8370 / almalinux-8-aarch64_checkpart1_platform-support-arm
• elasticsearch-periodic-platform-support #8370 / ubuntu-2404-aarch64_checkpart1_platform-support-arm
• elasticsearch-periodic-platform-support #8370 / ubuntu-2004-aarch64_checkpart1_platform-support-arm
• elasticsearch-pull-request #72260 / part-1
• elasticsearch-periodic #8353 / concurrent-search-tests
• elasticsearch-periodic #8353 / single-processor-node-tests
• elasticsearch-periodic-platform-support #8370 / oraclelinux-8_platform-support-unix
• elasticsearch-periodic-platform-support #8370 / rocky-8_platform-support-unix
• elasticsearch-periodic-platform-support #8370 / ubuntu-2404_platform-support-unix

Reproduction Line:

gradlew ":server:internalClusterTest" --tests "org.elasticsearch.reservedstate.service.FileSettingsServiceIT.testSymlinkUpdateTriggerReload" -Dtests.seed=36D12EEFE730B1E3 -Dtests.locale=dje-Latn-NE -Dtests.timezone=America/Caracas -Druntime.java=24

Applicable branches:
main

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: null

Issue Reasons:

• [main] 13 failures in test testSymlinkUpdateTriggerReload (2.8% fail rate in 466 executions)
• [main] 2 failures in pipeline elasticsearch-periodic-platform-support (18.2% fail rate in 11 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] 13 failures in test testSymlinkUpdateTriggerReload (2.8% fail rate in 466 executions)
• [main] 2 failures in pipeline elasticsearch-periodic-platform-support (18.2% fail rate in 11 executions)

Build Scans:

• elasticsearch-periodic-platform-support #8478 / windows-2025_checkpart1_platform-support-windows
• elasticsearch-periodic-platform-support #8370 / almalinux-8-aarch64_checkpart1_platform-support-arm
• elasticsearch-periodic-platform-support #8370 / ubuntu-2404-aarch64_checkpart1_platform-support-arm
• elasticsearch-periodic-platform-support #8370 / ubuntu-2004-aarch64_checkpart1_platform-support-arm
• elasticsearch-pull-request #72260 / part-1
• elasticsearch-periodic #8353 / concurrent-search-tests
• elasticsearch-periodic #8353 / single-processor-node-tests
• elasticsearch-periodic-platform-support #8370 / oraclelinux-8_platform-support-unix
• elasticsearch-periodic-platform-support #8370 / rocky-8_platform-support-unix
• elasticsearch-periodic-platform-support #8370 / ubuntu-2404_platform-support-unix

[elasticsearchmachine]

Pinging @elastic/es-distributed-indexing (Team:Distributed Indexing)

[albertzaharovits]

cc @jfreden

[elasticsearchmachine]

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

[jfreden]

The only valid failure is:
elasticsearch-periodic-platform-support #8478 / windows-2025_checkpart1_platform-support-windows the other failures were resolved by #128374 on May 26th.

The failure is a windows test where a bunch of other suites fail too, so this initially looks like a potential test infra issue. The test fails an assertion because the changed file settings are never picked up by the file watcher, will keep investigating but I'll label this as low-risk for now.