Allow to configure the default index pattern in Advanced Settings (#6453)

* Allow to configure the default index pattern in advanced settings

* Update config name (squash)

* Update config name (squash)

src/core_plugins/kibana/public/management/sections/indices/_create.js

@@ -22,8 +22,7 @@ uiModules.get('apps/management')
 
   // this and child scopes will write pattern vars here
   const index = $scope.index = {
-    name: 'logstash-*',
-
+    name: config.get('indexPattern:placeholder'),
     isTimeBased: true,
     nameIsPattern: false,
     notExpandable: false,

src/ui/settings/defaults.js

@@ -301,6 +301,10 @@ export default function defaultSettingsProvider() {
       description: 'The URL can sometimes grow to be too large for some browsers to ' +
         'handle. To counter-act this we are testing if storing parts of the URL in ' +
         'sessions storage could help. Please let us know how it goes!'
+    },
+    'indexPattern:placeholder': {
+      value: 'logstash-*',
+      description: 'The placeholder for the field "Index name or pattern" in the "Settings > Indices" tab.',
     }
   };
 };