Change back to private

Signed-off-by: Derek Ho <[email protected]>

src/main/java/org/opensearch/security/auth/UserInjector.java

@@ -67,7 +67,7 @@ public UserInjector(Settings settings, ThreadPool threadPool, AuditLog auditLog,
     }
 
     public static class InjectedUser extends User {
-        transient TransportAddress transportAddress;
+        private transient TransportAddress transportAddress;
 
         public InjectedUser(String name) {
             super(name);