[Issue 12726] [broker] Fix deadlock in metadata-store callback thread for branch 2.9 #13426
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Fixes #12726 for branch 2.9
Motivation
See #12726
#12753 fixed this in master, but can not merged into branch 2.9.
Modifications
Use thenAcceptAsync instead to avoid dead lock on metadata thread.
Verifying this change
This change is already covered by existing tests, such as org.apache.pulsar.broker.admin.PersistentTopicsTest
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Need to update docs?
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Bug fix.