Make GetIndexAction cancellable #87727
Merged
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The get-indices API does some nontrivial work on the master and at high
index counts the response may be very large and could take a long time
to compute. Some clients will time out and retry if it takes too long.
Today this API is not properly cancellable which leads to a good deal of
wasted work in this situation, and the potentially-enormous response is
serialized on a transport worker thread.
With this commit we make the API cancellable and move the serialization
to a
MANAGEMENT
thread.Backport of #87681
Relates #77466