[CI] DatafeedJobsRestIT testLookbackWithIndicesOptions failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-intake #12331 / part4
• elasticsearch-pull-request #39604 / part-4
• elasticsearch-pull-request #39601 / part-4
• elasticsearch-pull-request #39601 / part-4
• elasticsearch-pull-request #39593 / part-4
• elasticsearch-intake #12322 / part4
• elasticsearch-intake #12321 / part4
• elasticsearch-intake #12319 / part4
• elasticsearch-intake #12311 / part4
• elasticsearch-intake #12314 / part4

Reproduction Line:

./gradlew ":x-pack:plugin:ml:qa:native-multi-node-tests:javaRestTest" --tests "org.elasticsearch.xpack.ml.integration.DatafeedJobsRestIT.testLookbackWithIndicesOptions" -Dtests.seed=E7142F54D3B30265 -Dtests.locale=ar-DZ -Dtests.timezone=EST -Druntime.java=23

Applicable branches: 8.x

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.xpack.ml.integration.DatafeedJobsRestIT),title:'Suite',type:optionsListControl),'144933da-5c1b-4257-a969-7f43455a7901':(dataViewId:fbbdc689-be23-4b3d-8057-aa402e9ed0c5,fieldName:name.keyword,order:2,selectedOptions:!(testLookbackWithIndicesOptions),title:'Test',type:optionsListControl)))))

Failure Message:

org.elasticsearch.client.WarningFailureException: method [PUT], host [http://[::1]:39693], URI [/.hidden-index], status line [HTTP/1.1 200 OK]
Warnings: [Index [.hidden-index] name begins with a dot (.), which is deprecated, and will not be allowed in a future Elasticsearch version.]
{"acknowledged":true,"shards_acknowledged":true,"index":".hidden-index"}

Issue Reasons:

• [8.x] 10 consecutive failures in test testLookbackWithIndicesOptions
• [8.x] 6 consecutive failures in step part4
• [8.x] 4 consecutive failures in step part-4
• [8.x] 6 consecutive failures in pipeline elasticsearch-intake
• [8.x] 3 consecutive failures in pipeline elasticsearch-pull-request
• [8.x] 10 failures in test testLookbackWithIndicesOptions (100.0% fail rate in 10 executions)
• [8.x] 6 failures in step part4 (100.0% fail rate in 6 executions)
• [8.x] 4 failures in step part-4 (100.0% fail rate in 4 executions)
• [8.x] 6 failures in pipeline elasticsearch-intake (100.0% fail rate in 6 executions)
• [8.x] 3 failures in pipeline elasticsearch-pull-request (100.0% fail rate in 3 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] 2 consecutive failures in test testLookbackWithIndicesOptions
• [main] 2 consecutive failures in step part4
• [main] 2 consecutive failures in pipeline elasticsearch-intake
• [main] 2 failures in test testLookbackWithIndicesOptions (100.0% fail rate in 2 executions)
• [main] 2 failures in step part4 (100.0% fail rate in 2 executions)
• [main] 2 failures in pipeline elasticsearch-intake (100.0% fail rate in 2 executions)

Build Scans:

• elasticsearch-intake #12313 / part4
• elasticsearch-intake #12309 / part4

[elasticsearchmachine]

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

[davidkyle]

The test does indeed create a .hidden-index in order to test the expand wild card options. It is creating the hidden index that is causing the failure. Low risk as the test hasn't change, what has changed is that creating a dot prefixed index is now deprecated.