eagerly initialize OffHeapReflectionUtils

Author: ChrisHegarty

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

@@ -40,6 +40,7 @@
 import org.elasticsearch.entitlement.runtime.policy.entitlements.LoadNativeLibrariesEntitlement;
 import org.elasticsearch.env.Environment;
 import org.elasticsearch.index.IndexVersion;
+import org.elasticsearch.index.codec.vectors.reflect.OffHeapReflectionUtils;
 import org.elasticsearch.jdk.JarHell;
 import org.elasticsearch.jdk.RuntimeVersionFeature;
 import org.elasticsearch.monitor.jvm.HotThreads;
@@ -232,7 +233,9 @@ private static void initPhase2(Bootstrap bootstrap) throws IOException {
             // RequestHandlerRegistry and MethodHandlers classes do nontrivial static initialization which should always succeed but load
             // it now (before SM) to be sure
             RequestHandlerRegistry.class,
-            MethodHandlers.class
+            MethodHandlers.class,
+            // Ensure member access and reflection lookup are as expected
+            OffHeapReflectionUtils.class
         );
 
         // load the plugin Java modules and layers now for use in entitlements
@@ -394,7 +397,7 @@ private static void reflectiveStartProcess(ProcessBuilder pb) throws Exception {
     private static void ensureInitialized(Class<?>... classes) {
         for (final var clazz : classes) {
             try {
-                MethodHandles.publicLookup().ensureInitialized(clazz);
+                MethodHandles.lookup().ensureInitialized(clazz);
             } catch (IllegalAccessException unexpected) {
                 throw new AssertionError(unexpected);
             }