[CI] MixedClusterClientYamlTestSuiteIT test {p0=index/92_metrics_auto_subobjects/Root with metrics} failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #8153 / 8.16.6_bwc
• elasticsearch-periodic #8147 / 8.16.6_bwc
• elasticsearch-periodic #8141 / 8.16.6_bwc
• elasticsearch-periodic #8135 / 8.16.6_bwc
• elasticsearch-periodic #8129 / 8.16.6_bwc
• elasticsearch-periodic #8123 / 8.16.6_bwc
• elasticsearch-periodic #8117 / 8.16.6_bwc
• elasticsearch-periodic #8111 / 8.16.6_bwc
• elasticsearch-periodic #8105 / 8.16.6_bwc
• elasticsearch-periodic #8099 / 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/Root without subobjects with synthetic source}" -Dtests.seed=496845BDB67CEA2E -Dtests.bwc=true -Dtests.locale=fr-MU -Dtests.timezone=Canada/Mountain -Druntime.java=24

Applicable branches:
8.18

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: Failure at [index/92_metrics_auto_subobjects:207]: 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@8.16.6/org.elasticsearch.ElasticsearchException.guessRootCauses(ElasticsearchException.java:706)\n\tat org.elasticsearch.server@8.16.6/org.elasticsearch.ElasticsearchException.generateFailureXContent(ElasticsearchException.java:634)\n\tat org.elasticsearch.server@8.16.6/org.elasticsearch.rest.RestResponse.build(RestResponse.java:187)\n\tat org.elasticsearch.server@8.16.6/org.elasticsearch.rest.RestResponse.<init>(RestResponse.java:146)\n\tat org.elasticsearch.server@8.16.6/org.elasticsearch.rest.RestResponse.<init>(RestResponse.java:
[truncated]

Issue Reasons:

• [8.18] 22 consecutive failures in step 8.16.6_bwc
• [8.18] 22 failures in test test {p0=index/92_metrics_auto_subobjects/Root with metrics} (10.5% fail rate in 210 executions)
• [8.18] 22 failures in step 8.16.6_bwc (100.0% fail rate in 22 executions)
• [8.18] 22 failures in pipeline elasticsearch-periodic (100.0% fail rate in 22 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)