[9.0] Cancel expired async search task when a remote returns its results (#126583) #126915
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…lastic#126583) A while ago we enabled using ccs_minimize_roundtrips in async search. This makes it possible for users of async search to send a single search request per remote cluster, and minimize the impact of network latency. With non minimized roundtrips, we have pretty recurring cancellation checks: as part of the execution, we detect that a task expired whenever each shard comes back with its results. In a scenario where the coord node does not hold data, or only remote data is targeted by an async search, we have much less chance of detecting cancellation if roundtrips are minimized. The local coordinator would do nothing other than waiting for the minimized results from each remote cluster. One scenario where we can check for cancellation is when each cluster comes back with its full set of results. This commit adds such check, plus some testing for async search cancellation with minimized roundtrips.
javanna
added
:Search Foundations/CCS
>bug
auto-merge-without-approval
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Backports the following commits to 9.0: