assertion

Author: mhl-b

server/src/main/java/org/elasticsearch/cluster/routing/allocation/decider/Decision.java

@@ -194,6 +194,10 @@ enum Preferred {
      * Simple class representing a single decision
      */
     record Single(Type type, Preferred preferred, String label, String explanationString) implements Decision, ToXContentObject {
+        public Single {
+            assert type == Type.YES || preferred == Preferred.NO : "only YES type can have preference";
+        }
+
         /**
          * Creates a new {@link Single} decision of a given type
          * @param type {@link Type} of the decision