**Build scan:**
https://gradle-enterprise.elastic.co/s/qy6onbetucltw/tests/:x-pack:plugin:ml:qa:native-multi-node-tests:javaRestTest/org.elasticsearch.xpack.ml.integration.RegressionIT/testStopAndRestart

**Reproduction line:**
`./gradlew ':x-pack:plugin:ml:qa:native-multi-node-tests:javaRestTest' --tests "org.elasticsearch.xpack.ml.integration.RegressionIT.testStopAndRestart" -Dtests.seed=240EEA19C3741510 -Dtests.locale=es-HN -Dtests.timezone=America/Eirunepe -Druntime.java=17`

**Applicable branches:**
master

**Reproduces locally?:**
No

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.xpack.ml.integration.RegressionIT&tests.test=testStopAndRestart

**Failure excerpt:**
```
java.lang.AssertionError: progress is complete: [{"phase":"reindexing","progress_percent":100}, {"phase":"loading_data","progress_percent":100}, {"phase":"feature_selection","progress_percent":100}, {"phase":"coarse_parameter_search","progress_percent":100}, {"phase":"fine_tuning_parameters","progress_percent":100}, {"phase":"final_training","progress_percent":0}, {"phase":"writing_results","progress_percent":100}, {"phase":"inference","progress_percent":100}]
Expected: is <true>
     but: was <false>

  at __randomizedtesting.SeedInfo.seed([240EEA19C3741510:534668E7D79E13B0]:0)
  at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:18)
  at org.junit.Assert.assertThat(Assert.java:956)
  at org.elasticsearch.xpack.ml.integration.MlNativeDataFrameAnalyticsIntegTestCase.assertProgressComplete(MlNativeDataFrameAnalyticsIntegTestCase.java:199)
  at org.elasticsearch.xpack.ml.integration.RegressionIT.testStopAndRestart(RegressionIT.java:365)
  at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:-2)
  at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
  at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:568)
  at com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1758)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$8.evaluate(RandomizedRunner.java:946)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$9.evaluate(RandomizedRunner.java:982)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$10.evaluate(RandomizedRunner.java:996)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at org.apache.lucene.tests.util.TestRuleSetupTeardownChained$1.evaluate(TestRuleSetupTeardownChained.java:44)
  at org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
  at org.apache.lucene.tests.util.TestRuleThreadAndTestName$1.evaluate(TestRuleThreadAndTestName.java:45)
  at org.apache.lucene.tests.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:60)
  at org.apache.lucene.tests.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:44)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:375)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl.forkTimeoutingTask(ThreadLeakControl.java:824)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$3.evaluate(ThreadLeakControl.java:475)
  at com.carrotsearch.randomizedtesting.RandomizedRunner.runSingleTest(RandomizedRunner.java:955)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$5.evaluate(RandomizedRunner.java:840)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$6.evaluate(RandomizedRunner.java:891)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$7.evaluate(RandomizedRunner.java:902)
  at org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at org.apache.lucene.tests.util.TestRuleStoreClassName$1.evaluate(TestRuleStoreClassName.java:38)
  at com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)
  at com.carrotsearch.randomizedtesting.rules.NoShadowingOrOverridesOnMethodsRule$1.evaluate(NoShadowingOrOverridesOnMethodsRule.java:40)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at org.apache.lucene.tests.util.TestRuleAssertionsRequired$1.evaluate(TestRuleAssertionsRequired.java:53)
  at org.apache.lucene.tests.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:43)
  at org.apache.lucene.tests.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:44)
  at org.apache.lucene.tests.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:60)
  at org.apache.lucene.tests.util.TestRuleIgnoreTestSuites$1.evaluate(TestRuleIgnoreTestSuites.java:47)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:375)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl.lambda$forkTimeoutingTask$0(ThreadLeakControl.java:831)
  at java.lang.Thread.run(Thread.java:833)

```
x-pack/plugin/ml/qa/native-multi-node-tests/src/javaRestTest/java/org/elasticsearch/xpack/ml/integration/ClassificationIT.java
assertThat(preProcessor.isCustom(), is(false));
        }
    }
    public <T> void testWithOnlyTrainingRowsAndTrainingPercentIsFifty(
        String jobId,
        String dependentVariable,
        List<T> dependentVariableValues,
        String expectedMappingTypeForPredictedField
    ) throws Exception {
        initialize(jobId);
        String predictedClassField = dependentVariable + "_prediction";
        indexData(sourceIndex, 300, 0, dependentVariable);
        int numTopClasses = randomBoolean() ? 2 : -1;  
        int expectedNumTopClasses = 2;
        DataFrameAnalyticsConfig config = buildAnalytics(
            jobId,
            sourceIndex,
            destIndex,
            null,
            new Classification(dependentVariable, BoostedTreeParams.builder().build(), null, null, numTopClasses, 50.0, null, null, null)
        );
        putAnalytics(config);
        assertIsStopped(jobId);
        assertProgressIsZero(jobId);
        startAnalytics(jobId);
        waitUntilAnalyticsIsStopped(jobId);
        int trainingRowsCount = 0;
        int nonTrainingRowsCount = 0;
        client().admin().indices().refresh(new RefreshRequest(destIndex));
        SearchResponse sourceData = client().prepareSearch(sourceIndex).setTrackTotalHits(true).setSize(1000).get();