[9.0] Keep outstanding pages when finish buffer early (#121857) #121877
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Today, the exchange buffer of an exchange source is finished in two cases: (1) when the downstream pipeline has received enough data and (2) when all remote sinks have completed. In the first case, outstanding pages could be safely discarded. In the second case, no new pages should be received after finishing. In both scenarios, discarding all outstanding pages was safe if noMoreInputs was switched while adding pages. However, with the stop API, the buffer may now finish while keeping outstanding pages, and new pages may still be received. This change updates the exchange buffer to discard only the incoming page when noMoreInputs is switched, rather than all pages in the buffer. Closes elastic#120757
dnhatn
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:Analytics/ES|QL
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Backports the following commits to 9.0: