Add performance test for many fields

test/functional/fixtures/kbn_archiver/many_fields_data_view.json

@@ -0,0 +1,18 @@
+{
+  "attributes": {
+    "fieldAttrs": "{}",
+    "fields": "[]",
+    "runtimeFieldMap": "{}",
+    "title": "indices-stats*",
+    "typeMeta": "{}"
+  },
+  "coreMigrationVersion": "8.3.0",
+  "id": "35796250-bb09-11ec-a8e4-a9868e049a39",
+  "migrationVersion": {
+    "index-pattern": "8.0.0"
+  },
+  "references": [],
+  "type": "index-pattern",
+  "updated_at": "2022-04-13T09:07:56.793Z",
+  "version": "WzQwLDFd"
+}

x-pack/test/performance/tests/playwright/index.ts

@@ -15,6 +15,7 @@ export default function ({ loadTestFile, getService }: FtrProviderContext) {
     loadTestFile(require.resolve('./flight_dashboard'));
     loadTestFile(require.resolve('./web_logs_dashboard'));
     loadTestFile(require.resolve('./promotion_tracking_dashboard'));
+    loadTestFile(require.resolve('./many_fields_discover'));
 
     after(async () => {
       await performance.shutdownBrowser();

x-pack/test/performance/tests/playwright/many_fields_discover.ts

@@ -0,0 +1,58 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0; you may not use this file except in compliance with the Elastic License
+ * 2.0.
+ */
+import { FtrProviderContext } from '../../ftr_provider_context';
+import { StepCtx } from '../../services/performance';
+
+export default function manyFieldsDiscover({ getService }: FtrProviderContext) {
+  describe('many_fields_discover', () => {
+    const performance = getService('performance');
+    const esArchiver = getService('esArchiver');
+    const kibanaServer = getService('kibanaServer');
+
+    before(async () => {
+      await kibanaServer.importExport.load(
+        'test/functional/fixtures/kbn_archiver/many_fields_data_view'
+      );
+      await esArchiver.loadIfNeeded('test/functional/fixtures/es_archiver/many_fields');
+    });
+
+    after(async () => {
+      await kibanaServer.importExport.unload(
+        'test/functional/fixtures/kbn_archiver/many_fields_data_view'
+      );
+      await esArchiver.unload('test/functional/fixtures/es_archiver/many_fields');
+    });
+
+    it('many_fields_discover', async () => {
+      await performance.runUserJourney(
+        'many_fields_discover',
+        [
+          {
+            name: 'Go to Discover Page',
+            handler: async ({ page, kibanaUrl }: StepCtx) => {
+              await page.goto(`${kibanaUrl}/app/discover`);
+              await page.waitForSelector('[data-test-subj="discoverDocTable"]');
+            },
+          },
+          {
+            name: 'Expand the first document',
+            handler: async ({ page }) => {
+              const expandButtons = page.locator(
+                '[data-test-subj="docTableExpandToggleColumn"]'
+              );
+              await expandButtons.first().click();
+              await page.locator('text="Expanded document"');
+            }
+          }
+        ],
+        {
+          requireAuth: false,
+        }
+      );
+    });
+  });
+}