"Failure in bulk execution" error after entering email address in setup-wizard

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.4.13 DXP GA1, Master
• Fix Version/s: 7.4.13 DXP GA1, 7.4.3.4 CE GA4, Master
• Component/s: Search Infrastructure
• Labels:
  • search-board-in
• Fix Priority: 4
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/108490
• Bug Type: Regression Bug
• QA Test Name:
  • functional
• Quality Gate: Release Testing

Hello, while testing the release build (.7z file) built at GIT ID: 03206ea, the following startup error appears:

2021-10-12 14:47:22.268 ERROR [http-nio-8080-exec-4][BulkDocumentRequestExecutorImpl:57] failure in bulk execution:_[0]: index [liferay-20099], type [LiferayDocumentType], id [com.liferay.portal.kernel.model.Layout_PORTLET_10], message [[liferay-20099] ElasticsearchException[Elasticsearch exception [type=index_not_found_exception, reason=no such index [liferay-20099]]]]_[1]: index [liferay-20099], type [LiferayDocumentType], id [com.liferay.portal.kernel.model.Layout_PORTLET_10], message [[liferay-20099] ElasticsearchException[Elasticsearch exception [type=index_not_found_exception, reason=no such index [liferay-20099]]]] [Sanitized]
2021-10-12 14:47:22.270 ERROR [http-nio-8080-exec-4][ElasticsearchIndexWriter:361] Update failed
2021-10-12 14:47:22.346 ERROR [http-nio-8080-exec-4][BulkDocumentRequestExecutorImpl:57] failure in bulk execution:_[0]: index [liferay-20099], type [LiferayDocumentType], id [com.liferay.portal.kernel.model.Layout_PORTLET_11], message [[liferay-20099] ElasticsearchException[Elasticsearch exception [type=index_not_found_exception, reason=no such index [liferay-20099]]]]_[1]: index [liferay-20099], type [LiferayDocumentType], id [com.liferay.portal.kernel.model.Layout_PORTLET_11], message [[liferay-20099] ElasticsearchException[Elasticsearch exception [type=index_not_found_exception, reason=no such index [liferay-20099]]]] [Sanitized]
2021-10-12 14:47:22.347 ERROR [http-nio-8080-exec-4][ElasticsearchIndexWriter:361] Update failed

Step to reproduce:

1. Startup the release build mentioned above.
2. On setup wizard, enter an email address

Expected result:
No errors

Actual result
There are errors on the log related to Bulk execution failure / index not found. 
There are no errors after restarting.
Gist of console log
 
Note 
The error does not show up on the Jenkins logs.
Example:

1. Navigate to any test from the release tester results
2. Click Jenkins Console
3. Search for ElasticsearchIndexWriter

Reproduced on:
Tomcat 9.0.53 + MySQL 5.7. Portal GIT ID: 03206ea (Release build)
Tomcat 9.0.53 + MySQL 5.7 + Portal GIT ID: 697d9c1

Not Reproduced on:
Tomcat 9.0.53 + HSQL + Portal GIT ID: 697d9c1