[8.17] Fix CCS exchange when multi cluster aliases point to same cluster (#117297) #117388
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…astic#117297) [esql] > Unexpected error from Elasticsearch: illegal_state_exception - sink exchanger for id [ruxoDDxXTGW55oIPHoCT-g:964613010] already exists. This issue occurs when two or more clusterAliases point to the same physical remote cluster. The exchange service assumes the destination is unique, which is not true in this topology. This PR addresses the problem by appending a suffix using a monotonic increasing number, ensuring that different exchanges are created in such cases. Another issue arising from this behavior is that data on a remote cluster is processed multiple times, leading to incorrect results. I can work on the fix for this once we agree that this is an issue.
dnhatn
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Backports the following commits to 8.17: