[CI] MixedClusterClientYamlTestSuiteIT test {p0=index/92_metrics_auto_subobjects/Metrics object indexing} failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #7811 / 8.16.6_bwc
• elasticsearch-periodic #7805 / 8.16.6_bwc
• elasticsearch-periodic #7799 / 8.16.6_bwc
• elasticsearch-periodic #7793 / 8.16.6_bwc
• elasticsearch-periodic #7787 / 8.16.6_bwc
• elasticsearch-periodic #7781 / 8.16.6_bwc
• elasticsearch-periodic #7775 / 8.16.6_bwc
• elasticsearch-periodic #7769 / 8.16.6_bwc
• elasticsearch-periodic #7757 / 8.16.6_bwc
• elasticsearch-periodic #7751 / 8.16.6_bwc

Reproduction Line:

./gradlew ":qa:mixed-cluster:v8.16.6#mixedClusterTest" -Dtests.class="org.elasticsearch.backwards.MixedClusterClientYamlTestSuiteIT" -Dtests.method="test {p0=index/92_metrics_auto_subobjects/Metrics object indexing}" -Dtests.seed=44E5483D8E6FCE36 -Dtests.bwc=true -Dtests.locale=sq-AL -Dtests.timezone=CTT -Druntime.java=24

Applicable branches:
8.x

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: Failure at [index/92_metrics_auto_subobjects:8]: expected [2xx] status code but api [indices.put_index_template] returned [400 Bad Request] [{"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"composable template [test] template after composition is invalid","stack_trace":"org.elasticsearch.ElasticsearchException$1: composable template [test] template after composition is invalid\n\tat org.elasticsearch.server@8.19.0-SNAPSHOT/org.elasticsearch.ElasticsearchException.guessRootCauses(ElasticsearchException.java:707)\n\tat org.elasticsearch.server@8.19.0-SNAPSHOT/org.elasticsearch.ElasticsearchException.generateFailureXContent(ElasticsearchException.java:635)\n\tat org.elasticsearch.server@8.19.0-SNAPSHOT/org.elasticsearch.rest.RestResponse.build(RestResponse.java:201)\n\tat org.elasticsearch.server@8.19.0-SNAPSHOT/org.elasticsearch.rest.RestResponse.<init>(RestResponse.java:160)\n\tat org.elasticsearch.server@8.19.0-SNAPSHOT/org.elasticsearch.
[truncated]

Issue Reasons:

• [8.x] 8 consecutive failures in step 8.16.6_bwc
• [8.x] 20 failures in test test {p0=index/92_metrics_auto_subobjects/Metrics object indexing} (3.7% fail rate in 539 executions)
• [8.x] 20 failures in step 8.16.6_bwc (95.2% fail rate in 21 executions)
• [8.x] 20 failures in pipeline elasticsearch-periodic (95.2% fail rate in 21 executions)

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

[elasticsearchmachine]

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