[8.2] [Test] Use thread-safe hashSet for result collection (#85653) #85804
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Use regular HashSet in a deliberate concurrency code block sometimes results into unexpected behaviour: The hashSet has only a single item but size() reports 2. This PR replaces the regular hashSet with a thread-safe version to fix spurious test failures. Resolves: elastic#85411
ywangd
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Backports the following commits to 8.2: