[CI] XPackRestIT test {p0=ml/inference_processor/Test create processor with missing mandatory fields} failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #4104 / graalvm-ce17_checkpart3_java-matrix
• elasticsearch-periodic-platform-support #4009 / sles-15_platform-support-unix

Reproduction Line:

./gradlew ':x-pack:plugin:yamlRestTest' --tests "org.elasticsearch.xpack.test.rest.XPackRestIT.test {p0=ml/inference_processor/Test create processor with missing mandatory fields}" -Dtests.seed=ADDD0C09320A42DC -Dtests.locale=nl-BE -Dtests.timezone=America/Regina -Druntime.java=17

Applicable branches:
8.15

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

org.elasticsearch.client.ResponseException: method [GET], host [http://[::1]:32841], URI [/_ml/trained_models/_stats?size=10000], status line [HTTP/1.1 500 Internal Server Error]
{"error":{"root_cause":[],"type":"exception","reason":"Searching for stats for models [lang_ident_model_1,a-perfect-regression-model] failed","caused_by":{"type":"search_phase_execution_exception","reason":"","phase":"query","grouped":true,"failed_shards":[],"caused_by":{"type":"search_phase_execution_exception","reason":"Search rejected due to missing shards [[.ml-stats-000001][0]]. Consider using `allow_partial_search_results` setting to bypass this error.","phase":"query","grouped":true,"failed_shards":[]}}},"status":500}

Issue Reasons:

• [8.15] 2 failures in test test {p0=ml/inference_processor/Test create processor with missing mandatory fields} (0.8% fail rate in 257 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 {p0=ml/inference_processor/Test create processor with missing mandatory fields} (0.5% fail rate in 662 executions)

Build Scans:

• elasticsearch-periodic #3869 / graalvm-ce17_checkpart3_java-matrix
• elasticsearch-pull-request #29051 / rest-compatibility
• elasticsearch-pull-request #29051 / rest-compatibility

[elasticsearchmachine]

Pinging @elastic/es-search-relevance (Team:Search Relevance)

[elasticsearchmachine]

Pinging @elastic/ml-core (Team:ML)