[automation] update elastic stack version for testing 7.15.1-43bb4947#28320

Merged

mergify[bot] merged 1 commit into7.15from update-stack-version-20211008050747-7.15

Oct 8, 2021

+6-6

Commits on Oct 8, 2021

[Automation] Update elastic stack version to 7.15.1-43bb4947 for testing
apmmachine
committed