Associate sub-requests to their parent task in multi search API #44492
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Multi search accepts multiple search requests and runs them as
independent requests, each one as part of their own search task. Today
they don't get associated though with their parent multi search task,
which would be useful to monitor which msearch a certain search was part
of, if any, and also to cancel all of the sub-requests in case the
parent msearch gets cancelled (though this will require to make the
multi search task cancellable as a follow-up).