[CI] ClassificationIT testWithOnlyTrainingRowsAndTrainingPercentIsFifty_DependentVariableIsBoolean failing

[elasticsearchmachine]

Build Scans:

• elasticsearch-periodic #7044 / openjdk17_checkpart4_java-matrix
• elasticsearch-periodic #6995 / openjdk17_checkpart4_java-matrix
• elasticsearch-periodic #6995 / openjdk21_checkpart4_java-matrix

Reproduction Line:

./gradlew ":x-pack:plugin:ml:qa:native-multi-node-tests:javaRestTest" --tests "org.elasticsearch.xpack.ml.integration.ClassificationIT.testWithOnlyTrainingRowsAndTrainingPercentIsFifty_DependentVariableIsBoolean" -Dtests.seed=B63710B3BCE98353 -Dtests.locale=ar-JO -Dtests.timezone=PLT -Druntime.java=17

Applicable branches:
8.17

Reproduces locally?:
N/A

Failure History:
See dashboard

Failure Message:

java.lang.AssertionError: Stats were: {"id":"classification_training_percent_is_50_boolean","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":84},{"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":150,"test_docs_count":0,"skipped_docs_count":0},"memory_usage":{"timestamp":1742187083709,"peak_usage_bytes":19250,"status":"ok"},"node":{"id":"oWYFlkFmRJOijkenMn7bVw","name":"javaRestTest-2","ephemeral_id":"BeW-f7jETzqrtfM7ZUfZxw","transport_address":"127.0.0.1:38575","attributes":{"testattr":"test","transform.config_version":"10.0.0","xpack.installed":"true","ml.allocated_processors":"32","ml.max_jvm_size":"536870912","ml.config_vers
[truncated]

Issue Reasons:

• [8.17] 3 failures in test testWithOnlyTrainingRowsAndTrainingPercentIsFifty_DependentVariableIsBoolean (1.3% fail rate in 223 executions)
• [8.17] 2 failures in step openjdk17_checkpart4_java-matrix (25.0% fail rate in 8 executions)
• [8.17] 2 failures in pipeline elasticsearch-periodic (25.0% fail rate in 8 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 8.18

Mute Reasons:

• [8.18] 2 failures in test testWithOnlyTrainingRowsAndTrainingPercentIsFifty_DependentVariableIsBoolean (1.4% fail rate in 139 executions)

Build Scans:

• elasticsearch-periodic-platform-support #6614 / opensuse-leap-15_platform-support-unix
• elasticsearch-intake #18766 / part4

[elasticsearchmachine]

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

[valeriy42]

Closed in #125571