[CI] XPackRestIT class failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic-platform-support #10876 / windows-2022_checkpart3_platform-support-windows
• elasticsearch-periodic-platform-support #10846 / rhel-8_platform-support-unix

Reproduction Line:

gradlew ":x-pack:plugin:yamlRestTest" --tests "org.elasticsearch.xpack.test.rest.XPackRestIT.test {p0=ml/jobs_crud/Test open and close an unknown job is resource not found}" -Dtests.seed=CDA7885C99F34F24 -Dtests.locale=sa-IN -Dtests.timezone=Etc/GMT+9 -Druntime.java=25

Applicable branches:
9.1

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.IllegalStateException: Exception when waiting for [.ml-notifications-000002] template to be created

Issue Reasons:

• [9.1] 2 failures in class org.elasticsearch.xpack.test.rest.XPackRestIT (1.2% fail rate in 167 executions)
• [9.1] 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.

[elasticsearchmachine]

Pinging @elastic/es-search-relevance (Team:Search Relevance)

[elasticsearchmachine]

Pinging @elastic/ml-core (Team:ML)

[davidkyle]

Missing backport. Will be resolved by #135677