fix(QueryStringManager): Could not subscribe to application.currentAppId$

Partially revert opensearch-project#9466. Current implementation doesn't work because
QueryStringManager is constructed during setup, and setApplication
happens during start. In playground or any instance we see `Could not
subscribe to application.currentAppId$` in console warning.

Signed-off-by: Joshua Li <[email protected]>

Author: joshuali925

src/plugins/data/public/query/query_string/query_string_manager.ts

@@ -45,7 +45,6 @@ export class QueryStringManager {
   private queryHistory: QueryHistory;
   private datasetService!: DatasetServiceContract;
   private languageService!: LanguageServiceContract;
-  private currentAppId: string | undefined;
 
   constructor(
     private readonly storage: DataStorage,
@@ -58,17 +57,6 @@ export class QueryStringManager {
     this.queryHistory = createHistory({ storage: this.sessionStorage });
     this.datasetService = new DatasetService(uiSettings, this.sessionStorage);
     this.languageService = new LanguageService(this.defaultSearchInterceptor, this.storage);
-    try {
-      const application = getApplication();
-      if (application && application.currentAppId$) {
-        application.currentAppId$.subscribe((appId) => {
-          this.currentAppId = appId;
-        });
-      }
-    } catch (error) {
-      // eslint-disable-next-line no-console
-      console.warn('Could not subscribe to application.currentAppId$');
-    }
   }
 
   private getDefaultQueryString() {
@@ -361,15 +349,20 @@ export class QueryStringManager {
     return this.uiSettings.get(UI_SETTINGS.SEARCH_QUERY_LANGUAGE);
   }
 
-  private getCurrentAppId(): string | undefined {
+  private getCurrentAppId = () => {
+    let appId;
     try {
-      return this.currentAppId;
+      const application = getApplication();
+      if (application) {
+        application.currentAppId$.subscribe((val) => (appId = val)).unsubscribe();
+      }
     } catch (err) {
       // eslint-disable-next-line no-console
       console.error('Application Not available.');
     }
-    return undefined;
-  }
+
+    return appId;
+  };
 }
 
 const showWarning = (