[CI] MlHiddenIndicesFullClusterRestartIT testMlIndicesBecomeHidden {cluster=OLD} failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #9220 / 7.10.2_bwc
• elasticsearch-periodic #9220 / 7.9.3_bwc
• elasticsearch-periodic #9220 / 7.11.2_bwc
• elasticsearch-periodic #9220 / 7.2.1_bwc
• elasticsearch-periodic #9220 / 7.6.2_bwc
• elasticsearch-periodic #9220 / 7.8.1_bwc
• elasticsearch-periodic #9220 / 7.7.1_bwc
• elasticsearch-periodic #9220 / 7.0.1_bwc
• elasticsearch-periodic #9220 / 7.3.2_bwc
• elasticsearch-periodic #9220 / 7.4.2_bwc

Reproduction Line:

./gradlew ":x-pack:qa:full-cluster-restart:v7.10.2#bwcTest" -Dtests.class="org.elasticsearch.xpack.restart.MlHiddenIndicesFullClusterRestartIT" -Dtests.method="testMlIndicesBecomeHidden {cluster=OLD}" -Dtests.seed=3AF6E7150F105AAD -Dtests.bwc=true -Dtests.locale=sr-Cyrl-BA -Dtests.timezone=America/Pangnirtung -Druntime.java=24

Applicable branches:
8.19

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

org.elasticsearch.client.ResponseException: method [POST], host [http://[::1]:36349], URI [/_ml/anomaly_detectors/ml-hidden-indices-old-cluster-job/_open], status line [HTTP/1.1 500 Internal Server Error]
{"error":{"root_cause":[{"type":"exception","reason":"Unexpected job state [failed] while waiting for job to be opened"}],"type":"exception","reason":"Unexpected job state [failed] while waiting for job to be opened"},"status":500}

Issue Reasons:

• [8.19] 2 consecutive failures in test testMlIndicesBecomeHidden {cluster=OLD}
• [8.19] 2 consecutive failures in step 7.10.2_bwc
• [8.19] 2 consecutive failures in step 7.9.3_bwc
• [8.19] 2 consecutive failures in step 7.11.2_bwc
• [8.19] 2 consecutive failures in step 7.2.1_bwc
• [8.19] 2 consecutive failures in step 7.6.2_bwc
• [8.19] 2 consecutive failures in step 7.8.1_bwc
• [8.19] 2 consecutive failures in step 7.7.1_bwc
• [8.19] 2 consecutive failures in step 7.0.1_bwc
• [8.19] 2 consecutive failures in step 7.3.2_bwc
• [8.19] 2 consecutive failures in step 7.4.2_bwc
• [8.19] 2 consecutive failures in step 7.5.2_bwc
• [8.19] 2 consecutive failures in step 7.1.1_bwc
• [8.19] 24 failures in test testMlIndicesBecomeHidden {cluster=OLD} (7.7% fail rate in 311 executions)
• [8.19] 2 failures in step 7.10.2_bwc (66.7% fail rate in 3 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)