[CI] EnrichIT testDeleteExistingPipeline failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #4478 / encryption-at-rest
• elasticsearch-periodic-platform-support #4429 / debian-11_platform-support-unix
• elasticsearch-periodic-platform-support #4424 / debian-11_platform-support-unix

Reproduction Line:

./gradlew ":x-pack:plugin:enrich:qa:rest:javaRestTest" --tests "org.elasticsearch.xpack.enrich.EnrichIT.testDeleteExistingPipeline" -Dtests.seed=5A0B08C754C968D8 -Dtests.locale=cv-Cyrl-RU -Dtests.timezone=Etc/GMT+9 -Druntime.java=22

Applicable branches: 8.16

Reproduces locally?: N/A

Failure History: See dashboard

Failure Message:

org.elasticsearch.client.WarningFailureException: method [DELETE], host [http://127.0.0.1:32995], URI [*,-.ds-ilm-history-*,-.ds-.slm-history-*,-.ds-.watcher-history-*?expand_wildcards=open%2Cclosed%2Chidden], status line [HTTP/1.1 200 OK]
Warnings: [this request accesses system indices: [.inference], but in a future major version, direct access to system indices will be prevented by default]
{"acknowledged":true}

Issue Reasons:

• [8.16] 3 failures in test testDeleteExistingPipeline (1.8% fail rate in 169 executions)
• [8.16] 2 failures in step debian-11_platform-support-unix (50.0% fail rate in 4 executions)
• [8.16] 2 failures in pipeline elasticsearch-periodic-platform-support (33.3% fail rate in 6 executions)

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