[CI] ClassificationIT testDependentVariableIsAliasToKeyword failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #6960 / openjdk22_checkpart4_java-matrix
• elasticsearch-periodic #6848 / openjdk17_checkpart4_java-matrix

Reproduction Line:

./gradlew ":x-pack:plugin:ml:qa:native-multi-node-tests:javaRestTest" --tests "org.elasticsearch.xpack.ml.integration.ClassificationIT.testDependentVariableIsAliasToKeyword" -Dtests.seed=F11D70CBAB5F2CEC -Dtests.locale=en-NL -Dtests.timezone=America/Santiago -Druntime.java=22

Applicable branches:
8.17

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: Stats were: {"id":"dependent_variable_is_alias","state":"started","progress":[{"phase":"reindexing","progress_percent":100},{"phase":"loading_data","progress_percent":100},{"phase":"feature_selection","progress_percent":100},{"phase":"coarse_parameter_search","progress_percent":85},{"phase":"fine_tuning_parameters","progress_percent":0},{"phase":"final_training","progress_percent":0},{"phase":"writing_results","progress_percent":0},{"phase":"inference","progress_percent":0}],"data_counts":{"training_docs_count":100,"test_docs_count":0,"skipped_docs_count":0},"memory_usage":{"timestamp":1741841626872,"peak_usage_bytes":14710,"status":"ok"},"node":{"id":"jL_9KMc6Sp2iVXWyB_BpKA","name":"javaRestTest-1","ephemeral_id":"a-_O04kjT3qJZ7Lzw3DDAg","transport_address":"127.0.0.1:37367","attributes":{"testattr":"test","xpack.installed":"true","transform.config_version":"10.0.0","ml.allocated_processors_double":"32.0","ml.machine_memory":"126604214272","ml.config_version"
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Issue Reasons:

• [8.17] 2 failures in test testDependentVariableIsAliasToKeyword (0.4% fail rate in 529 executions)
• [8.17] 2 failures in pipeline elasticsearch-periodic (11.8% fail rate in 17 executions)

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

[elasticsearchmachine]

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