[Test] Modify assert statement for ssl handshake (#32072)

There have been changes in error messages for `SSLHandshakeException`.
This has caused a couple of failures in our tests.
This commit modifies test verification to assert on exception type of
class `SSLHandshakeException`.
There was another issue in Java11 which caused NPE. The bug has now
been fixed on Java11 - early access build 22.
Bug Ref: https://bugs.java.com/bugdatabase/view_bug.do?bug_id=8206355
Enable the skipped tests due to this bug.

Closes #31940

client/rest/src/test/java/org/elasticsearch/client/RestClientBuilderIntegTests.java

@@ -30,6 +30,7 @@ import org.junit.BeforeClass;
 
 import javax.net.ssl.KeyManagerFactory;
 import javax.net.ssl.SSLContext;
+import javax.net.ssl.SSLHandshakeException;
 import javax.net.ssl.TrustManagerFactory;
 import java.io.IOException;
 import java.io.InputStream;
@@ -37,7 +38,7 @@ import java.net.InetAddress;
 import java.net.InetSocketAddress;
 import java.security.KeyStore;
 
-import static org.hamcrest.Matchers.containsString;
+import static org.hamcrest.Matchers.instanceOf;
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertThat;
 import static org.junit.Assert.fail;
@@ -72,9 +73,6 @@ public class RestClientBuilderIntegTests extends RestClientTestCase {
     }
 
     public void testBuilderUsesDefaultSSLContext() throws Exception {
-        assumeFalse("Due to bug inside jdk, this test can't momentarily run with java 11. " +
-                "See: https://github.com/elastic/elasticsearch/issues/31940",
-            System.getProperty("java.version").contains("11"));
         final SSLContext defaultSSLContext = SSLContext.getDefault();
         try {
             try (RestClient client = buildRestClient()) {
@@ -82,7 +80,7 @@ public class RestClientBuilderIntegTests extends RestClientTestCase {
                     client.performRequest(new Request("GET", "/"));
                     fail("connection should have been rejected due to SSL handshake");
                 } catch (Exception e) {
-                    assertThat(e.getMessage(), containsString("General SSLEngine problem"));
+                    assertThat(e, instanceOf(SSLHandshakeException.class));
                 }
             }
 

x-pack/qa/smoke-test-plugins-ssl/src/test/java/org/elasticsearch/smoketest/SmokeTestMonitoringWithSecurityIT.java

@@ -127,7 +127,6 @@ public class SmokeTestMonitoringWithSecurityIT extends ESIntegTestCase {
         return monitoringUsage.get().getExporters().isEmpty() == false;
     }
 
-    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/31940")
     public void testHTTPExporterWithSSL() throws Exception {
         // Ensures that the exporter is actually on
         assertBusy(() -> assertThat("[_http] exporter is not defined", getMonitoringUsageExportersDefined(), is(true)));