Revert "Workaround for JDK 14 EA FileChannel.map issue (#50523)" (#51323)

This reverts commit c7fd24ca1569a809b499caf34077599e463bb8d6.

Now that JDK-8236582 is fixed in JDK 14 EA, we can revert the workaround.

Relates #50523 and #50512

server/src/main/java/org/elasticsearch/bootstrap/Bootstrap.java

@@ -19,13 +19,14 @@
 
 package org.elasticsearch.bootstrap;
 
-import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
+import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.core.Appender;
 import org.apache.logging.log4j.core.LoggerContext;
 import org.apache.logging.log4j.core.appender.ConsoleAppender;
 import org.apache.logging.log4j.core.config.Configurator;
 import org.apache.lucene.util.Constants;
+import org.elasticsearch.core.internal.io.IOUtils;
 import org.apache.lucene.util.StringHelper;
 import org.elasticsearch.ElasticsearchException;
 import org.elasticsearch.Version;
@@ -40,7 +41,6 @@ import org.elasticsearch.common.settings.KeyStoreWrapper;
 import org.elasticsearch.common.settings.SecureSettings;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.transport.BoundTransportAddress;
-import org.elasticsearch.core.internal.io.IOUtils;
 import org.elasticsearch.env.Environment;
 import org.elasticsearch.monitor.jvm.JvmInfo;
 import org.elasticsearch.monitor.os.OsProbe;
@@ -158,24 +158,6 @@ final class Bootstrap {
         JvmInfo.jvmInfo();
     }
 
-    /**
-     * JDK 14 bug:
-     * https://github.com/elastic/elasticsearch/issues/50512
-     * We circumvent it here by loading the offending class before installing security manager.
-     *
-     * To be removed once the JDK is fixed.
-     */
-    static void fixJDK14EAFileChannelMap() {
-        // minor time-bomb here to ensure that we reevaluate if final 14 version does not include fix.
-        if (System.getProperty("java.version").equals("14-ea")) {
-            try {
-                Class.forName("jdk.internal.misc.ExtendedMapMode", true, Bootstrap.class.getClassLoader());
-            } catch (ClassNotFoundException e) {
-                throw new RuntimeException("Unable to lookup ExtendedMapMode class", e);
-            }
-        }
-    }
-
     private void setup(boolean addShutdownHook, Environment environment) throws BootstrapException {
         Settings settings = environment.settings();
 
@@ -227,8 +209,6 @@ final class Bootstrap {
         // Log ifconfig output before SecurityManager is installed
         IfConfig.logIfNecessary();
 
-        fixJDK14EAFileChannelMap();
-
         // install SM after natives, shutdown hooks, etc.
         try {
             Security.configure(environment, BootstrapSettings.SECURITY_FILTER_BAD_DEFAULTS_SETTING.get(settings));

test/framework/src/main/java/org/elasticsearch/bootstrap/BootstrapForTesting.java

@@ -102,8 +102,6 @@ public class BootstrapForTesting {
         // Log ifconfig output before SecurityManager is installed
         IfConfig.logIfNecessary();
 
-        Bootstrap.fixJDK14EAFileChannelMap();
-
         // install security manager if requested
         if (systemPropertyAsBoolean("tests.security.manager", true)) {
             try {