migrates notification server routes to NP (elastic#57906)

x-pack/legacy/plugins/ml/server/new_platform/plugin.ts

@@ -33,7 +33,6 @@ import { dataFeedRoutes } from '../routes/datafeeds';
 import { indicesRoutes } from '../routes/indices';
 import { jobValidationRoutes } from '../routes/job_validation';
 import { makeMlUsageCollector } from '../lib/ml_telemetry';
-// @ts-ignore: could not find declaration file for module
 import { notificationRoutes } from '../routes/notification_settings';
 // @ts-ignore: could not find declaration file for module
 import { systemRoutes } from '../routes/system';

x-pack/legacy/plugins/ml/server/routes/apidoc.json

@@ -92,6 +92,8 @@
     "EstimateBucketSpan",
     "CalculateModelMemoryLimit",
     "ValidateCardinality",
-    "ValidateJob"
+    "ValidateJob",
+    "NotificationSettings",
+    "GetNotificationSettings"
   ]
 }

x-pack/legacy/plugins/ml/server/routes/notification_settings.ts

@@ -0,0 +1,43 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import { licensePreRoutingFactory } from '../new_platform/licence_check_pre_routing_factory';
+import { wrapError } from '../client/error_wrapper';
+import { RouteInitialization } from '../new_platform/plugin';
+
+/**
+ * Routes for notification settings
+ */
+export function notificationRoutes({ xpackMainPlugin, router }: RouteInitialization) {
+  /**
+   * @apiGroup NotificationSettings
+   *
+   * @api {get} /api/ml/notification_settings Get notification settings
+   * @apiName GetNotificationSettings
+   * @apiDescription Returns cluster notification settings
+   */
+  router.get(
+    {
+      path: '/api/ml/notification_settings',
+      validate: false,
+    },
+    licensePreRoutingFactory(xpackMainPlugin, async (context, request, response) => {
+      try {
+        const params = {
+          includeDefaults: true,
+          filterPath: '**.xpack.notification',
+        };
+        const resp = await context.ml!.mlClient.callAsCurrentUser('cluster.getSettings', params);
+
+        return response.ok({
+          body: resp,
+        });
+      } catch (e) {
+        return response.customError(wrapError(e));
+      }
+    })
+  );
+}