flink-connector-elasticsearch
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[FLINK-38054] flink-connector-elasticsearch8 use correct ClassLoader in OperationSerializer
Fixes FLINK-38054
I am not sure this is the best solution in this case, but it mitigates the original problem of Operation classes being invisible during deserialization.
The PR branch is opened from last main branch commit for version 3.1.0, so that it is compatible with Flink version 1.20.