[CI] DesiredNodesUpgradeIT testUpgradeDesiredNodes {upgradedNodes=2} failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #4665 / 8.13.4_bwc
• elasticsearch-periodic #4660 / openjdk17_8.16.0_java-matrix-bwc

Reproduction Line:

./gradlew ":qa:rolling-upgrade:v8.13.4#bwcTest" -Dtests.class="org.elasticsearch.upgrades.DesiredNodesUpgradeIT" -Dtests.method="testUpgradeDesiredNodes {upgradedNodes=2}" -Dtests.seed=B652AF7DB9AE97C9 -Dtests.bwc=true -Dtests.locale=es-NI -Dtests.timezone=GB -Druntime.java=23

Applicable branches: 8.16

Reproduces locally?: N/A

Failure History: See dashboard&_a=(controlGroupState:(initialChildControlState:('0c0c9cb8-ccd2-45c6-9b13-96bac4abc542':(dataViewId:fbbdc689-be23-4b3d-8057-aa402e9ed0c5,fieldName:task.keyword,order:0,selectedOptions:!(),title:'GradleTask',type:optionsListControl),'4e6ad9d6-6fdc-4fcc-bf1a-aa6ca79e0850':(dataViewId:fbbdc689-be23-4b3d-8057-aa402e9ed0c5,fieldName:className.keyword,order:1,selectedOptions:!(org.elasticsearch.upgrades.DesiredNodesUpgradeIT),title:'Suite',type:optionsListControl),'144933da-5c1b-4257-a969-7f43455a7901':(dataViewId:fbbdc689-be23-4b3d-8057-aa402e9ed0c5,fieldName:name.keyword,order:2,selectedOptions:!(testUpgradeDesiredNodes%20%7BupgradedNodes%3D2%7D),title:'Test',type:optionsListControl)))))

Failure Message:

org.elasticsearch.client.ResponseException: method [PUT], host [http://[::1]:36339], URI [/_internal/desired_nodes/upgrade_test/3], status line [HTTP/1.1 400 Bad Request]
{"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"Some nodes contain the same setting value [test-cluster-0, test-cluster-1] for [node.external_id]"}],"type":"illegal_argument_exception","reason":"Some nodes contain the same setting value [test-cluster-0, test-cluster-1] for [node.external_id]"},"status":400}

Issue Reasons:

• [8.16] 2 failures in test testUpgradeDesiredNodes {upgradedNodes=2} (2.2% fail rate in 91 executions)
• [8.16] 2 failures in pipeline elasticsearch-periodic (50.0% fail rate in 4 executions)

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

[elasticsearchmachine]

Pinging @elastic/es-core-infra (Team:Core/Infra)

[ldematte]

@arteam do you think https://github.com/elastic/elasticsearch/pull/115829 could be related?

[elasticsearchmachine]

Pinging @elastic/es-distributed (Team:Distributed)