[CI] DocsClientYamlTestSuiteIT test {yaml=reference/index-modules/slowlog/line_102} failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #6085 / openjdk21_checkpart1_java-matrix
• elasticsearch-pull-request #53493 / part-1
• elasticsearch-pull-request #53066 / part-1

Reproduction Line:

./gradlew ":docs:yamlRestTest" --tests "org.elasticsearch.smoketest.DocsClientYamlTestSuiteIT.test {yaml=reference/index-modules/slowlog/line_102}" -Dtests.seed=AE7B9EF1232FC029 -Dtests.locale=ff-Latn-CM -Dtests.timezone=America/Costa_Rica -Druntime.java=21

Applicable branches:
main

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: Failure at [reference/index-modules/slowlog:10]: got unexpected warning header [
	299 Elasticsearch-9.0.0-6e471eaaf3d2f1b1ced256fade12d09c9a66cf76 "this request accesses system indices: [.security-7], but in a future major version, direct access to system indices will be prevented by default"
]

Issue Reasons:

• [main] 3 failures in test test {yaml=reference/index-modules/slowlog/line_102} (0.4% fail rate in 803 executions)
• [main] 2 failures in step part-1 (0.6% fail rate in 353 executions)
• [main] 2 failures in pipeline elasticsearch-pull-request (0.5% fail rate in 384 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] 3 failures in test test {yaml=reference/index-modules/slowlog/line_102} (0.4% fail rate in 803 executions)
• [main] 2 failures in step part-1 (0.6% fail rate in 353 executions)
• [main] 2 failures in pipeline elasticsearch-pull-request (0.5% fail rate in 384 executions)

Build Scans:

• elasticsearch-periodic #6085 / openjdk21_checkpart1_java-matrix
• elasticsearch-pull-request #53493 / part-1
• elasticsearch-pull-request #53066 / part-1

[elasticsearchmachine]

Pinging @elastic/es-delivery (Team:Delivery)