Fix failing es promotion #160295 (#167359)

## Summary

Fixes #160295


### Checklist

Delete any items that are not applicable to this PR.

- [ ] Any text added follows [EUI's writing
guidelines](https://elastic.github.io/eui/#/guidelines/writing), uses
sentence case text and includes [i18n
support](https://github.com/elastic/kibana/blob/main/packages/kbn-i18n/README.md)
- [ ]
[Documentation](https://www.elastic.co/guide/en/kibana/master/development-documentation.html)
was added for features that require explanation or tutorials
- [ ] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [ ] Any UI touched in this PR is usable by keyboard only (learn more
about [keyboard accessibility](https://webaim.org/techniques/keyboard/))
- [ ] Any UI touched in this PR does not create any new axe failures
(run axe in browser:
[FF](https://addons.mozilla.org/en-US/firefox/addon/axe-devtools/),
[Chrome](https://chrome.google.com/webstore/detail/axe-web-accessibility-tes/lhdoppojpmngadmnindnejefpokejbdd?hl=en-US))
- [ ] If a plugin configuration key changed, check if it needs to be
allowlisted in the cloud and added to the [docker
list](https://github.com/elastic/kibana/blob/main/src/dev/build/tasks/os_packages/docker_generator/resources/base/bin/kibana-docker)
- [ ] This renders correctly on smaller devices using a responsive
layout. (You can test this [in your
browser](https://www.browserstack.com/guide/responsive-testing-on-local-server))
- [ ] This was checked for [cross-browser
compatibility](https://www.elastic.co/support/matrix#matrix_browsers)


### Risk Matrix

Delete this section if it is not applicable to this PR.

Before closing this PR, invite QA, stakeholders, and other developers to
identify risks that should be tested prior to the change/feature
release.

When forming the risk matrix, consider some of the following examples
and how they may potentially impact the change:

| Risk | Probability | Severity | Mitigation/Notes |

|---------------------------|-------------|----------|-------------------------|
| Multiple Spaces—unexpected behavior in non-default Kibana Space.
| Low | High | Integration tests will verify that all features are still
supported in non-default Kibana Space and when user switches between
spaces. |
| Multiple nodes—Elasticsearch polling might have race conditions
when multiple Kibana nodes are polling for the same tasks. | High | Low
| Tasks are idempotent, so executing them multiple times will not result
in logical error, but will degrade performance. To test for this case we
add plenty of unit tests around this logic and document manual testing
procedure. |
| Code should gracefully handle cases when feature X or plugin Y are
disabled. | Medium | High | Unit tests will verify that any feature flag
or plugin combination still results in our service operational. |
| [See more potential risk
examples](https://github.com/elastic/kibana/blob/main/RISK_MATRIX.mdx) |


### For maintainers

- [ ] This was checked for breaking API changes and was [labeled
appropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

src/core/server/integration_tests/saved_objects/migrations/group2/batch_size_bytes.test.ts

@@ -55,8 +55,7 @@ async function fetchDocuments(esClient: ElasticsearchClient, index: string) {
 
 const assertMigratedDocuments = (arr: any[], target: any[]) => target.every((v) => arr.includes(v));
 
-// FAILING ES PROMOTION: https://github.com/elastic/kibana/issues/160295
-describe.skip('migration v2', () => {
+describe('migration v2', () => {
   let esServer: TestElasticsearchUtils;
   let root: Root;
   let startES: () => Promise<TestElasticsearchUtils>;
@@ -119,7 +118,7 @@ describe.skip('migration v2', () => {
     await root.preboot();
     await root.setup();
     await expect(root.start()).rejects.toMatchInlineSnapshot(
-      `[Error: Unable to complete saved object migrations for the [.kibana] index: The document with _id "canvas-workpad-template:workpad-template-061d7868-2b4e-4dc8-8bf7-3772b52926e5" is 1715318 bytes which exceeds the configured maximum batch size of 1015275 bytes. To proceed, please increase the 'migrations.maxBatchSizeBytes' Kibana configuration option and ensure that the Elasticsearch 'http.max_content_length' configuration option is set to an equal or larger value.]`
+      `[Error: Unable to complete saved object migrations for the [.kibana] index: The document with _id "canvas-workpad-template:workpad-template-061d7868-2b4e-4dc8-8bf7-3772b52926e5" is 1715319 bytes which exceeds the configured maximum batch size of 1015275 bytes. To proceed, please increase the 'migrations.maxBatchSizeBytes' Kibana configuration option and ensure that the Elasticsearch 'http.max_content_length' configuration option is set to an equal or larger value.]`
     );
 
     await retryAsync(
@@ -132,7 +131,7 @@ describe.skip('migration v2', () => {
         expect(
           records.find((rec) =>
             rec.message.startsWith(
-              `Unable to complete saved object migrations for the [.kibana] index: The document with _id "canvas-workpad-template:workpad-template-061d7868-2b4e-4dc8-8bf7-3772b52926e5" is 1715318 bytes which exceeds the configured maximum batch size of 1015275 bytes. To proceed, please increase the 'migrations.maxBatchSizeBytes' Kibana configuration option and ensure that the Elasticsearch 'http.max_content_length' configuration option is set to an equal or larger value.`
+              `Reason: Unable to complete saved object migrations for the [.kibana] index: The document with _id "canvas-workpad-template:workpad-template-061d7868-2b4e-4dc8-8bf7-3772b52926e5" is 1715319 bytes which exceeds the configured maximum batch size of 1015275 bytes. To proceed, please increase the 'migrations.maxBatchSizeBytes' Kibana configuration option and ensure that the Elasticsearch 'http.max_content_length' configuration option is set to an equal or larger value.`
             )
           )
         ).toBeDefined();

src/core/server/integration_tests/saved_objects/migrations/group3/actions/actions_test_suite.ts

@@ -756,8 +756,7 @@ export const runActionTestSuite = ({
 
   // Reindex doesn't return any errors on it's own, so we have to test
   // together with waitForReindexTask
-  // Failing: See https://github.com/elastic/kibana/issues/166190
-  describe.skip('reindex & waitForReindexTask', () => {
+  describe('reindex & waitForReindexTask', () => {
     it('resolves right when reindex succeeds without reindex script', async () => {
       const res = (await reindex({
         client,
@@ -1120,15 +1119,17 @@ export const runActionTestSuite = ({
       `);
     });
     it('resolves left wait_for_task_completion_timeout when the task does not finish within the timeout', async () => {
-      await waitForIndexStatus({
+      const readyTaskRes = await waitForIndexStatus({
         client,
-        index: '.kibana_1',
+        index: 'existing_index_with_docs',
         status: 'yellow',
       })();
 
+      expect(Either.isRight(readyTaskRes)).toBe(true);
+
       const res = (await reindex({
         client,
-        sourceIndex: '.kibana_1',
+        sourceIndex: 'existing_index_with_docs',
         targetIndex: 'reindex_target',
         reindexScript: Option.none,
         requireAlias: false,
@@ -1467,7 +1468,7 @@ export const runActionTestSuite = ({
     it('resolves left wait_for_task_completion_timeout when the task does not complete within the timeout', async () => {
       const res = (await pickupUpdatedMappings(
         client,
-        '.kibana_1',
+        'existing_index_with_docs',
         1000
       )()) as Either.Right<UpdateByQueryResponse>;