[CI] MixedClusterClientYamlTestSuiteIT test {p0=indices.put_index_template/15_composition/Composable index templates that include subobjects: auto at root} failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #8477 / 8.16.6_bwc
• elasticsearch-periodic #8471 / 8.16.6_bwc
• elasticsearch-periodic #8465 / 8.16.6_bwc
• elasticsearch-periodic #8459 / 8.16.6_bwc
• elasticsearch-periodic #8453 / 8.16.6_bwc
• elasticsearch-periodic #8447 / 8.16.6_bwc
• elasticsearch-periodic #8441 / 8.16.6_bwc
• elasticsearch-periodic #8435 / 8.16.6_bwc
• elasticsearch-periodic #8429 / 8.16.6_bwc
• elasticsearch-periodic #8423 / 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=99BD4EA29009C4B9 -Dtests.bwc=true -Dtests.locale=vi -Dtests.timezone=Asia/Almaty -Druntime.java=24

Applicable branches:
8.19

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@8.16.6/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:11
[truncated]

Issue Reasons:

• [8.19] 21 consecutive failures in step 8.16.6_bwc
• [8.19] 21 failures in test test {p0=indices.put_index_template/15_composition/Composable index templates that include subobjects: auto at root} (4.0% fail rate in 529 executions)
• [8.19] 21 failures in step 8.16.6_bwc (100.0% fail rate in 21 executions)
• [8.19] 21 failures in pipeline elasticsearch-periodic (100.0% 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)

[elasticsearchmachine]

Pinging @elastic/es-data-management (Team:Data Management)

[nielsbauman]

Actually, this looks more like mappings to me. Forwarding to Search Foundations.

[elasticsearchmachine]

Pinging @elastic/es-search-foundations (Team:Search Foundations)