Disable MethodHandles in HSearch, even with GraalVM 21+

It causes weird errors when mass indexing, probably because
the MethodHandles implementation in native mode is not completely
thread-safe.

For example:

Entities that could not be indexed correctly:
Person#212 : org.hibernate.search.util.common.SearchException:
HSEARCH900005: Exception while invoking 'private java.lang.Long
io.quarkus.it.hibernate.search.elasticsearch.search.Person.id' on
'io.quarkus.it.hibernate.search.elasticsearch.search.Person@33be79fb'.
...
Caused by: java.lang.ClassCastException:
io.quarkus.it.hibernate.search.elasticsearch.search.Address cannot be
cast to io.quarkus.it.hibernate.search.elasticsearch.search.Person

extensions/hibernate-search-orm-elasticsearch/runtime/src/main/java/io/quarkus/hibernate/search/orm/elasticsearch/runtime/HibernateSearchElasticsearchRecorder.java

@@ -138,15 +138,9 @@ public void contributeBootProperties(BiConsumer<String, Object> propertyCollecto
         @Override
         public void onMetadataInitialized(Metadata metadata, BootstrapContext bootstrapContext,
                 BiConsumer<String, Object> propertyCollector) {
-            Version graalVMVersion = Version.getCurrent();
-            final boolean isAOT = Boolean.getBoolean("com.oracle.graalvm.isaot");
-            boolean isGraalVM20OrBelow = isAOT && graalVMVersion.compareTo(GRAAL_VM_VERSION_21) < 0;
             HibernateOrmIntegrationBooter booter = HibernateOrmIntegrationBooter.builder(metadata, bootstrapContext)
-                    .valueReadHandleFactory(
-                            // GraalVM 20 or below doesn't support method handles
-                            isGraalVM20OrBelow ? ValueReadHandleFactory.usingJavaLangReflect()
-                                    // GraalVM 21+ and OpenJDK can handle the default (method handles)
-                                    : null)
+                    // MethodHandles don't work at all in GraalVM 20 and below, and seem unreliable on GraalVM 21
+                    .valueReadHandleFactory(ValueReadHandleFactory.usingJavaLangReflect())
                     .build();
             booter.preBoot(propertyCollector);
         }