Don't try to get the native code version in the transport client (elastic/x-pack-elasticsearch#600)

The native controller process won't be running

Original commit: elastic/x-pack-elasticsearch@d848e86cd5

plugin/src/main/java/org/elasticsearch/xpack/ml/MachineLearningFeatureSet.java

@@ -33,6 +33,8 @@ public class MachineLearningFeatureSet implements XPackFeatureSet {
         this.enabled = XPackSettings.MACHINE_LEARNING_ENABLED.get(settings);
         this.licenseState = licenseState;
         Map<String, Object> nativeCodeInfo = NativeController.UNKNOWN_NATIVE_CODE_INFO;
+        // Don't try to get the native code version in the transport client - the controller process won't be running
+        if (XPackPlugin.transportClientMode(settings) == false) {
             try {
                 NativeController nativeController = NativeControllerHolder.getNativeController(settings);
                 if (nativeController != null) {
@@ -45,6 +47,7 @@ public class MachineLearningFeatureSet implements XPackFeatureSet {
                             + "- please check that you are running on a supported platform");
                 }
             }
+        }
         this.nativeCodeInfo = nativeCodeInfo;
     }