[8.9] Increase timeout for costly ".kibana split" integration test (e…

…lastic#160631) (elastic#161078)

# Backport

This will backport the following commits from `main` to `8.9`:
- [Increase timeout for costly ".kibana split" integration test
(elastic#160631)](elastic#160631)

<!--- Backport version: 8.9.7 -->

### Questions ?
Please refer to the [Backport tool
documentation](https://github.com/sqren/backport)

<!--BACKPORT [{"author":{"name":"Gerard
Soldevila","email":"[email protected]"},"sourceCommit":{"committedDate":"2023-07-03T10:38:13Z","message":"Increase
timeout for costly \".kibana split\" integration test
(elastic#160631)\n\nTackles
https://github.com/elastic/kibana/issues/157510\r\n\r\nNothing's wrong
with the test, it's only that it's a bit costly, as it\r\nmigrates a
100k SO archive.\r\n\r\nThis PR simply increases the timeout for the
conflicting
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timeout for costly \".kibana split\" integration test
(elastic#160631)\n\nTackles
https://github.com/elastic/kibana/issues/157510\r\n\r\nNothing's wrong
with the test, it's only that it's a bit costly, as it\r\nmigrates a
100k SO archive.\r\n\r\nThis PR simply increases the timeout for the
conflicting
test.","sha":"646d2e897e92471ea29448ca6a792181ed699e99"}},"sourceBranch":"main","suggestedTargetBranches":["8.9"],"targetPullRequestStates":[{"branch":"8.9","label":"v8.9.0","labelRegex":"^v(\\d+).(\\d+).\\d+$","isSourceBranch":false,"state":"NOT_CREATED"},{"branch":"main","label":"v8.10.0","labelRegex":"^v8.10.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/160631","number":160631,"mergeCommit":{"message":"Increase
timeout for costly \".kibana split\" integration test
(elastic#160631)\n\nTackles
https://github.com/elastic/kibana/issues/157510\r\n\r\nNothing's wrong
with the test, it's only that it's a bit costly, as it\r\nmigrates a
100k SO archive.\r\n\r\nThis PR simply increases the timeout for the
conflicting test.","sha":"646d2e897e92471ea29448ca6a792181ed699e99"}}]}]
BACKPORT-->

Co-authored-by: Gerard Soldevila <[email protected]>

src/core/server/integration_tests/saved_objects/migrations/group3/dot_kibana_split.test.ts

@@ -412,9 +412,8 @@ describe('split .kibana index into multiple system indices', () => {
     });
   });
 
-  // FLAKY: https://github.com/elastic/kibana/issues/157510
-  // This test takes too long. Can be manually executed to verify the correct behavior.
-  describe.skip('when multiple Kibana migrators run in parallel', () => {
+  describe('when multiple Kibana migrators run in parallel', () => {
+    jest.setTimeout(1200000);
     it('correctly migrates 7.7.2_xpack_100k_obj.zip archive', async () => {
       esServer = await startElasticsearch({
         dataArchive: Path.join(__dirname, '..', 'archives', '7.7.2_xpack_100k_obj.zip'),
@@ -491,7 +490,7 @@ describe('split .kibana index into multiple system indices', () => {
           task: 5,
         },
       });
-    }, 1200000);
+    });
 
     afterEach(async () => {
       await esServer?.stop();