[9.0] Add migration test for .async-search system index (#121517) #121647
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This change adds migration testing for the ".async-search" system index to the full cluster upgrade tests that perform updates from versions N-2 to N via N-1. The test creates a system index by using async_search on a cluster with version N-2, then calls the "_migrate" API in version N-1 and finally checks that on the upgraded cluster in N we are still able to retrieve async search results from previous versions and can still write to the system index. This is necessary to ensure we don't end up with a write-only async search system index when migrating to version 9.
cbuescher
added
:Search Foundations/Search
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Backports the following commits to 9.0: