(Not 100% sure who owns threadpools, whether it's core/infra or the distributed team)

**Build scan:**
https://gradle-enterprise.elastic.co/s/6bnqyucslkqwu/tests/:server:test/org.elasticsearch.threadpool.ScalingThreadPoolTests/testScalingThreadPoolConfiguration

**Reproduction line:**
```
./gradlew ':server:test' --tests "org.elasticsearch.threadpool.ScalingThreadPoolTests.testScalingThreadPoolConfiguration" -Dtests.seed=723A4CB306D59946 -Dtests.locale=zh-SG -Dtests.timezone=Asia/Aqtau -Druntime.java=17
```

**Applicable branches:**
main

**Reproduces locally?:**
Yes

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.threadpool.ScalingThreadPoolTests&tests.test=testScalingThreadPoolConfiguration

**Failure excerpt:**
```
java.lang.AssertionError: 
Expected: <10>
     but: was <5>

  at __randomizedtesting.SeedInfo.seed([723A4CB306D59946:5FBC453C30C07715]:0)
  at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:18)
  at org.junit.Assert.assertThat(Assert.java:956)
  at org.junit.Assert.assertThat(Assert.java:923)
  at org.elasticsearch.threadpool.ScalingThreadPoolTests.lambda$testScalingThreadPoolConfiguration$0(ScalingThreadPoolTests.java:105)
  at org.elasticsearch.threadpool.ScalingThreadPoolTests.runScalingThreadPoolTest(ScalingThreadPoolTests.java:433)
  at org.elasticsearch.threadpool.ScalingThreadPoolTests.testScalingThreadPoolConfiguration(ScalingThreadPoolTests.java:88)
  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:390)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl.forkTimeoutingTask(ThreadLeakControl.java:843)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl$3.evaluate(ThreadLeakControl.java:490)
  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:390)
  at com.carrotsearch.randomizedtesting.ThreadLeakControl.lambda$forkTimeoutingTask$0(ThreadLeakControl.java:850)
  at java.lang.Thread.run(Thread.java:833)

```
server/src/main/java/org/elasticsearch/threadpool/ThreadPool.java
*/
    public ExecutorService generic() {
        return executor(Names.GENERIC);
    }
    /**
     * Get the {@link ExecutorService} with the given name. This executor service's
     * {@link Executor#execute(Runnable)} method will run the {@link Runnable} it is given in the
     * {@link ThreadContext} of the thread that queues it.
     * <p>
     * Warning: this {@linkplain ExecutorService} might not throw {@link RejectedExecutionException}
     * if you submit a task while it shutdown. It will instead silently queue it and not run it.
     *
     * @param name the name of the executor service to obtain
     * @throws IllegalArgumentException if no executor service with the specified name exists
     */
    public ExecutorService executor(String name) {
        final ExecutorHolder holder = executors.get(name);
        if (holder == null) {
            throw new IllegalArgumentException("no executor service found for [" + name + "]");
        }
        return holder.executor();
    }
    /**
     * Schedules a one-shot command to run after a given delay. The command is run in the context of the calling thread.
     *
     * @param command the command to run
     * @param delay delay before the task executes
     * @param executor the name of the thread pool on which to execute this task. SAME means "execute on the scheduler thread" which changes
     *        the meaning of the ScheduledFuture returned by this method. In that case the ScheduledFuture will complete only when the
     *        command completes.