**Build scan:**
https://gradle-enterprise.elastic.co/s/7maeknveofx2c/tests/:x-pack:plugin:transform:qa:multi-node-tests:javaRestTest/org.elasticsearch.xpack.transform.integration.TransformIT/testStopWaitForCheckpoint

**Reproduction line:**
`./gradlew ':x-pack:plugin:transform:qa:multi-node-tests:javaRestTest' --tests "org.elasticsearch.xpack.transform.integration.TransformIT.testStopWaitForCheckpoint" -Dtests.seed=3D08A69740D0585E -Dtests.locale=sr-Latn-BA -Dtests.timezone=SystemV/AST4 -Druntime.java=16`

**Applicable branches:**
master, 7.15

**Reproduces locally?:**
Didn't try

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.xpack.transform.integration.TransformIT&tests.test=testStopWaitForCheckpoint

**Failure excerpt:**
```
java.lang.AssertionError: expected:<1> but was:<0>

  at __randomizedtesting.SeedInfo.seed([3D08A69740D0585E:40DD8AFC8C44B268]:0)
  at org.junit.Assert.fail(Assert.java:88)
  at org.junit.Assert.failNotEquals(Assert.java:834)
  at org.junit.Assert.assertEquals(Assert.java:645)
  at org.junit.Assert.assertEquals(Assert.java:631)
  at org.elasticsearch.xpack.transform.integration.TransformIntegTestCase.lambda$waitUntilCheckpoint$0(TransformIntegTestCase.java:236)
  at org.elasticsearch.test.ESTestCase.assertBusy(ESTestCase.java:1039)
  at org.elasticsearch.xpack.transform.integration.TransformIntegTestCase.waitUntilCheckpoint(TransformIntegTestCase.java:235)
  at org.elasticsearch.xpack.transform.integration.TransformIntegTestCase.waitUntilCheckpoint(TransformIntegTestCase.java:231)
  at org.elasticsearch.xpack.transform.integration.TransformIT.testStopWaitForCheckpoint(TransformIT.java:284)
  at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(NativeMethodAccessorImpl.java:-2)
  at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
  at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:567)
  at com.carrotsearch.randomizedtesting.RandomizedRunner.invoke(RandomizedRunner.java:1750)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$8.evaluate(RandomizedRunner.java:938)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$9.evaluate(RandomizedRunner.java:974)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$10.evaluate(RandomizedRunner.java:988)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at org.apache.lucene.util.TestRuleSetupTeardownChained$1.evaluate(TestRuleSetupTeardownChained.java:49)
  at org.apache.lucene.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:45)
  at org.apache.lucene.util.TestRuleThreadAndTestName$1.evaluate(TestRuleThreadAndTestName.java:48)
  at org.apache.lucene.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:64)
  at org.apache.lucene.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:47)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:368)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl.forkTimeoutingTask(ThreadLeakControl.java:817)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$3.evaluate(ThreadLeakControl.java:468)
  at com.carrotsearch.randomizedtesting.RandomizedRunner.runSingleTest(RandomizedRunner.java:947)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$5.evaluate(RandomizedRunner.java:832)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$6.evaluate(RandomizedRunner.java:883)
  at com.carrotsearch.randomizedtesting.RandomizedRunner$7.evaluate(RandomizedRunner.java:894)
  at org.apache.lucene.util.AbstractBeforeAfterRule$1.evaluate(AbstractBeforeAfterRule.java:45)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at org.apache.lucene.util.TestRuleStoreClassName$1.evaluate(TestRuleStoreClassName.java:41)
  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.util.TestRuleAssertionsRequired$1.evaluate(TestRuleAssertionsRequired.java:53)
  at org.apache.lucene.util.TestRuleMarkFailure$1.evaluate(TestRuleMarkFailure.java:47)
  at org.apache.lucene.util.TestRuleIgnoreAfterMaxFailures$1.evaluate(TestRuleIgnoreAfterMaxFailures.java:64)
  at org.apache.lucene.util.TestRuleIgnoreTestSuites$1.evaluate(TestRuleIgnoreTestSuites.java:54)
  at com.carrotsearch.randomizedtesting.rules.StatementAdapter.evaluate(StatementAdapter.java:36)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$StatementRunner.run(ThreadLeakControl.java:368)
  at java.lang.Thread.run(Thread.java:831)

```
x-pack/plugin/transform/qa/multi-node-tests/src/javaRestTest/java/org/elasticsearch/xpack/transform/integration/TransformIT.java
import org.elasticsearch.xpack.core.transform.transforms.SettingsConfig;
import org.elasticsearch.xpack.core.transform.transforms.TimeRetentionPolicyConfig;
import org.elasticsearch.xpack.core.transform.transforms.TimeSyncConfig;
import org.elasticsearch.xpack.core.transform.transforms.TransformConfig;
import org.elasticsearch.xpack.core.transform.transforms.pivot.SingleGroupSource;
import org.elasticsearch.xpack.core.transform.transforms.pivot.TermsGroupSource;
import org.junit.After;
import org.junit.Before;
import java.io.IOException;
import java.time.Instant;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;
import static org.elasticsearch.xcontent.XContentFactory.jsonBuilder;
import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.greaterThan;
import static org.hamcrest.Matchers.hasKey;
import static org.hamcrest.Matchers.lessThan;
import static org.hamcrest.Matchers.not;
import static org.hamcrest.Matchers.oneOf;
@SuppressWarnings("removal")
public class TransformIT extends TransformRestTestCase {
    private static final int NUM_USERS = 28;
    static Integer getUserIdForRow(int row) {
        return row % NUM_USERS;
    }
    static String getDateStringForRow(int row) {
        int day = (11 + (row / 100)) % 28;
        int hour = 10 + (row % 13);
        int min = 10 + (row % 49);