[Discover] Unskip "search source fetch" flaky tests (#165586)

Normal test:
- Closes https://github.com/elastic/kibana/issues/139879
100x
https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/3056
100x
https://buildkite.com/elastic/kibana-flaky-test-suite-runner/builds/3070

Similar Serverless tests:
- https://github.com/elastic/kibana/issues/165660
- https://github.com/elastic/kibana/issues/165624
- https://github.com/elastic/kibana/issues/165623
- https://github.com/elastic/kibana/issues/165503
- https://github.com/elastic/kibana/issues/165502
- https://github.com/elastic/kibana/issues/165379

---------

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>

test/examples/search/warnings.ts

@@ -26,8 +26,7 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
   const kibanaServer = getService('kibanaServer');
   const esArchiver = getService('esArchiver');
 
-  // Failing: See https://github.com/elastic/kibana/issues/139879
-  describe.skip('handling warnings with search source fetch', function () {
+  describe('handling warnings with search source fetch', function () {
     const dataViewTitle = 'sample-01,sample-01-rollup';
     const fromTime = 'Jun 17, 2022 @ 00:00:00.000';
     const toTime = 'Jun 23, 2022 @ 00:00:00.000';
@@ -122,8 +121,12 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
       // click "see full error" button in the toast
       const [openShardModalButton] = await testSubjects.findAll('openShardFailureModalBtn');
       await openShardModalButton.click();
-      const modalHeader = await testSubjects.find('shardFailureModalTitle');
-      expect(await modalHeader.getVisibleText()).to.be('2 of 4 shards failed');
+
+      await retry.waitFor('modal title visible', async () => {
+        const modalHeader = await testSubjects.find('shardFailureModalTitle');
+        return (await modalHeader.getVisibleText()) === '2 of 4 shards failed';
+      });
+
       // request
       await testSubjects.click('shardFailuresModalRequestButton');
       const requestBlock = await testSubjects.find('shardsFailedModalRequestBlock');
@@ -169,8 +172,12 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
       const [openShardModalButton] = await testSubjects.findAll('openShardFailureModalBtn');
       await openShardModalButton.click();
       await testSubjects.exists('shardFailureModalTitle');
-      const modalHeader = await testSubjects.find('shardFailureModalTitle');
-      expect(await modalHeader.getVisibleText()).to.be('2 of 4 shards failed');
+
+      await retry.waitFor('modal title visible', async () => {
+        const modalHeader = await testSubjects.find('shardFailureModalTitle');
+        return (await modalHeader.getVisibleText()) === '2 of 4 shards failed';
+      });
+
       // request
       await testSubjects.click('shardFailuresModalRequestButton');
       const requestBlock = await testSubjects.find('shardsFailedModalRequestBlock');

x-pack/test_serverless/functional/test_suites/common/examples/search/warnings.ts

@@ -125,8 +125,12 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
       // click "see full error" button in the toast
       const [openShardModalButton] = await testSubjects.findAll('openShardFailureModalBtn');
       await openShardModalButton.click();
-      const modalHeader = await testSubjects.find('shardFailureModalTitle');
-      expect(await modalHeader.getVisibleText()).to.be('2 of 4 shards failed');
+
+      await retry.waitFor('modal title visible', async () => {
+        const modalHeader = await testSubjects.find('shardFailureModalTitle');
+        return (await modalHeader.getVisibleText()) === '2 of 4 shards failed';
+      });
+
       // request
       await testSubjects.click('shardFailuresModalRequestButton');
       const requestBlock = await testSubjects.find('shardsFailedModalRequestBlock');
@@ -171,8 +175,12 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
       // click "see full error" button in the toast
       const [openShardModalButton] = await testSubjects.findAll('openShardFailureModalBtn');
       await openShardModalButton.click();
-      const modalHeader = await testSubjects.find('shardFailureModalTitle');
-      expect(await modalHeader.getVisibleText()).to.be('2 of 4 shards failed');
+
+      await retry.waitFor('modal title visible', async () => {
+        const modalHeader = await testSubjects.find('shardFailureModalTitle');
+        return (await modalHeader.getVisibleText()) === '2 of 4 shards failed';
+      });
+
       // request
       await testSubjects.click('shardFailuresModalRequestButton');
       const requestBlock = await testSubjects.find('shardsFailedModalRequestBlock');

x-pack/test_serverless/tsconfig.json

@@ -45,7 +45,6 @@
     "@kbn/cases-plugin",
     "@kbn/test-subj-selector",
     "@kbn/core-http-common",
-    "@kbn/std",
     "@kbn/data-views-plugin",
     "@kbn/core-saved-objects-server",
     "@kbn/security-api-integration-helpers",
@@ -54,5 +53,6 @@
     "@kbn/dev-utils",
     "@kbn/bfetch-plugin",
     "@kbn/rison",
+    "@kbn/std",
   ]
 }