[CI] DocsClientYamlTestSuiteIT test {yaml=reference/troubleshooting/common-issues/disk-usage-exceeded/line_65} failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic-platform-support #6834 / almalinux-8_platform-support-unix
• elasticsearch-periodic-platform-support #6698 / opensuse-leap-15_platform-support-unix

Reproduction Line:

./gradlew ":docs:yamlRestTest" --tests "org.elasticsearch.smoketest.DocsClientYamlTestSuiteIT.test {yaml=reference/troubleshooting/common-issues/disk-usage-exceeded/line_65}" -Dtests.seed=23B37F550F23A493 -Dtests.locale=mg-MG -Dtests.timezone=America/Argentina/Buenos_Aires -Druntime.java=24

Applicable branches:
8.18

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: Failure at [reference/troubleshooting/common-issues/disk-usage-exceeded:78]: got unexpected warning header [
	299 Elasticsearch-8.18.0-0f574736a1869440d4bfad63123da87584bbecff "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:

• [8.18] 2 failures in test test {yaml=reference/troubleshooting/common-issues/disk-usage-exceeded/line_65} (0.3% fail rate in 742 executions)
• [8.18] 2 failures in pipeline elasticsearch-periodic-platform-support (10.5% fail rate in 19 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/troubleshooting/common-issues/disk-usage-exceeded/line_65} (0.3% fail rate in 869 executions)
• [main] 2 failures in step part-1-entitlements (7.1% fail rate in 28 executions)
• [main] 2 failures in pipeline elasticsearch-pull-request (0.5% fail rate in 415 executions)

Build Scans:

• elasticsearch-intake #18591 / part1
• elasticsearch-pull-request #57794 / part-1-entitlements
• elasticsearch-pull-request #57696 / part-1-entitlements

[elasticsearchmachine]

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