This looks to be consistently failing on Windows due to slightly differnent failure message formatting accross platforms.

**Build scan:**
https://gradle-enterprise.elastic.co/s/rbripi2x273se/tests/:x-pack:plugin:shutdown:qa:multi-node:javaRestTest/org.elasticsearch.xpack.shutdown.NodeShutdownIT/testShutdownReadinessService

**Reproduction line:**
`gradlew ':x-pack:plugin:shutdown:qa:multi-node:javaRestTest' --tests "org.elasticsearch.xpack.shutdown.NodeShutdownIT.testShutdownReadinessService" -Dtests.seed=CE16C1C13086F07B -Dtests.locale=id -Dtests.timezone=Asia/Colombo -Druntime.java=17`

**Applicable branches:**
master

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

**Failure history:**
https://gradle-enterprise.elastic.co/scans/tests?tests.container=org.elasticsearch.xpack.shutdown.NodeShutdownIT&tests.test=testShutdownReadinessService

**Failure excerpt:**
```
org.junit.ComparisonFailure: expected:<Connection refused[]> but was:<Connection refused[: connect]>

  at __randomizedtesting.SeedInfo.seed([CE16C1C13086F07B:35BD8BB92E9A4F3]:0)
  at org.junit.Assert.assertEquals(Assert.java:115)
  at org.junit.Assert.assertEquals(Assert.java:144)
  at org.elasticsearch.test.readiness.ReadinessClientProbe.lambda$tcpReadinessProbeFalse$2(ReadinessClientProbe.java:69)
  at java.security.AccessController.doPrivileged(AccessController.java:318)
  at org.elasticsearch.test.readiness.ReadinessClientProbe.tcpReadinessProbeFalse(ReadinessClientProbe.java:67)
  at org.elasticsearch.xpack.shutdown.NodeShutdownIT.testShutdownReadinessService(NodeShutdownIT.java:133)
  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/shutdown/qa/multi-node/src/javaRestTest/java/org/elasticsearch/xpack/shutdown/NodeShutdownIT.java
Map<String, Object> nodeObject = (Map<String, Object>) nodesObject.get(nodeId);
        Map<String, Object> httpObject = (Map<String, Object>) nodeObject.get("http");
        String publishAddress = (String) httpObject.get("publish_address");
        String readinessPorts = this.getTestReadinessPorts();
        String restPorts = this.getTestRestCluster();
        String[] restAddresses = restPorts.split(",");
        int nodeIndex = 0;
        for (String restAddress : restAddresses) {
            
            if (restAddress.startsWith("[")) {
                continue;
            }
            if (restAddress.equals(publishAddress)) {
                break;
            }
            nodeIndex++;
        }
        String[] readinessAddresses = readinessPorts.split(",");
        String readinessAddress = readinessAddresses[nodeIndex];
        String portStr = readinessAddress.split(":")[1];
        Integer port = Integer.parseInt(portStr);
        
        tcpReadinessProbeTrue(port);
        
        checkCRUD(nodeId, randomFrom("restart", "RESTART"), "1ms", null, false);
        tcpReadinessProbeFalse(port);
        
        Request deleteRequest = new Request("DELETE", "_nodes/" + nodeId + "/shutdown");
        assertOK(client().performRequest(deleteRequest));
        assertNoShuttingDownNodes(nodeId);