Build Scans:

• elasticsearch-intake #20078 / part2
• elasticsearch-intake #20063 / part2

Reproduction Line:

./gradlew ":x-pack:plugin:ilm:internalClusterTest" --tests "org.elasticsearch.xpack.ilm.DataStreamAndIndexLifecycleMixingTests.testUpdateIndexTemplateFromILMtoBothILMAndDataStreamLifecycle" -Dtests.seed=278C43E22FB0D44C -Dtests.locale=syr-Syrc-IQ -Dtests.timezone=SystemV/EST5EDT -Druntime.java=23

Applicable branches:
main

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.util.concurrent.ExecutionException: [.ds-datastream-boemntfvfhb-2025.03.14-000004] org.elasticsearch.index.IndexNotFoundException: no such index [.ds-datastream-boemntfvfhb-2025.03.14-000004]

Issue Reasons:

• [main] 2 failures in test testUpdateIndexTemplateFromILMtoBothILMAndDataStreamLifecycle (0.9% fail rate in 227 executions)
• [main] 2 failures in step part2 (7.4% fail rate in 27 executions)
• [main] 2 failures in pipeline elasticsearch-intake (7.4% fail rate in 27 executions)

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