AMBARI-11562. The value of 'Max idle tez session length' from the default Hive config group can be changed when you are at setting of aother Hive config group (alexantonenko)

ambari-web/app/views/common/configs/widgets/plain_config_text_field.js

@@ -30,6 +30,10 @@ App.PlainConfigTextField = Ember.View.extend(App.SupportsDependentConfigs, App.W
   classNames: ['widget-config-plain-text-field'],
   placeholderBinding: 'config.savedValue',
 
+  disabled: function() {
+    return !this.get('config.isEditable');
+  }.property('config.isEditable'),
+
   configLabel: function() {
     return this.get('config.stackConfigProperty.displayName') || this.get('config.displayName') || this.get('config.name');
   }.property('config.name', 'config.displayName'),