[CI] DataStreamLifecycleServiceIT testAutomaticForceMerge failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic-platform-support #7007 / ubuntu-2004-aarch64_checkpart1_platform-support-arm
• elasticsearch-periodic-platform-support #7007 / ubuntu-2004_platform-support-unix
• elasticsearch-periodic #6985 / openjdk23_entitlements_true_checkpart1_java-matrix
• elasticsearch-pull-request #62601 / part-1

Reproduction Line:

./gradlew ":modules:data-streams:internalClusterTest" --tests "org.elasticsearch.datastreams.lifecycle.DataStreamLifecycleServiceIT.testAutomaticForceMerge" -Dtests.seed=A4A18D06FC83A975 -Dtests.locale=ksb -Dtests.timezone=America/Cambridge_Bay -Druntime.java=23

Applicable branches:
main

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.ArrayIndexOutOfBoundsException: Index 1 out of bounds for length 1

Issue Reasons:

• [main] 4 failures in test testAutomaticForceMerge (1.9% fail rate in 214 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] 2 failures in test testAutomaticForceMerge (1.0% fail rate in 209 executions)

Build Scans:

• elasticsearch-periodic-platform-support #7007 / ubuntu-2004_platform-support-unix
• elasticsearch-pull-request #62601 / part-1

[elasticsearchmachine]

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