No index pattern routing (opensearch-project#4401)

Should redirect to stack management page if there is no index pattern detected.

Signed-off-by: abbyhu2000 <[email protected]>

src/plugins/dashboard/public/plugin.tsx

@@ -374,6 +374,13 @@ export class DashboardPlugin
       mount: async (params: AppMountParameters) => {
         const [coreStart, pluginsStart, dashboardStart] = await core.getStartServices();
         this.currentHistory = params.history;
+
+        // make sure the index pattern list is up to date
+        pluginsStart.data.indexPatterns.clearCache();
+        // make sure a default index pattern exists
+        // if not, the page will be redirected to management and dashboard won't be rendered
+        await pluginsStart.data.indexPatterns.ensureDefaultIndexPattern();
+
         appMounted();
         const {
           embeddable: embeddableStart,