HTTP API to stop task-manager from running tasks

x-pack/plugins/task_manager/server/plugin.ts

@@ -116,6 +116,11 @@ export class TaskManagerPlugin
         startServicesPromise.then(({ elasticsearch }) => elasticsearch.client),
     });
 
+    router.post({ path: '/api/task_manager/_stop', validate: false }, async (context, req, res) => {
+      this.taskPollingLifecycle!.stop();
+      return res.ok({ body: `Aye, aye, captain` });
+    });
+
     core.status.derivedStatus$.subscribe((status) =>
       this.logger.debug(`status core.status.derivedStatus now set to ${status.level}`)
     );

x-pack/plugins/task_manager/server/polling_lifecycle.ts

@@ -216,6 +216,10 @@ export class TaskPollingLifecycle {
     });
   }
 
+  public stop() {
+    this.taskClaiming.excludedTaskTypes = ['*'];
+  }
+
   public get events(): Observable<TaskLifecycleEvent> {
     return this.events$;
   }

x-pack/plugins/task_manager/server/queries/task_claiming.ts

@@ -121,7 +121,7 @@ export class TaskClaiming {
   private logger: Logger;
   private readonly taskClaimingBatchesByType: TaskClaimingBatches;
   private readonly taskMaxAttempts: Record<string, number>;
-  private readonly excludedTaskTypes: string[];
+  public excludedTaskTypes: string[];
   private readonly unusedTypes: string[];
 
   /**