Omit ha default on create only; keep default on read and update schemas

Author: pyadagiri-do

specification/resources/kubernetes/models/cluster.yml

@@ -143,7 +143,6 @@ properties:
 
   ha:
     type: boolean
-    default: true
     example: true
     description: A boolean value indicating whether the control plane
       is run in a highly available configuration in the cluster. Highly available