[ML] Lower Scale to Zero to 4 hours

Author: prwhelan

x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/MachineLearning.java

@@ -763,7 +763,7 @@ public void loadExtensions(ExtensionLoader loader) {
      */
     public static final Setting<TimeValue> SCALE_TO_ZERO_AFTER_NO_REQUESTS_TIME = Setting.timeSetting(
         "xpack.ml.trained_models.adaptive_allocations.scale_to_zero_time",
-        TimeValue.timeValueHours(24),
+        TimeValue.timeValueHours(4),
         TimeValue.timeValueMinutes(1),
         Property.Dynamic,
         Setting.Property.NodeScope