Remove Netty logging hack (#24653)

Netty removed a logging guarded we added to prevent a scary logging
message. We added a hack to work around this. They've added the guard
back, so we can remove the hack now.

modules/transport-netty4/src/main/java/org/elasticsearch/transport/netty4/Netty4InternalESLogger.java

@@ -101,12 +101,8 @@ class Netty4InternalESLogger extends AbstractInternalLogger {
 
     @Override
     public void info(String msg) {
-        if (!("Your platform does not provide complete low-level API for accessing direct buffers reliably. " +
-                "Unless explicitly requested, heap buffer will always be preferred to avoid potential system " +
-                "instability.").equals(msg)) {
         logger.info(msg);
     }
-    }
 
     @Override
     public void info(String format, Object arg) {