[8.0] Skip automatically preserved request headers when rewriting (#79973) #79983
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…79973) In elastic#79412 we fixed a bug that request headers got dropped when the request is sent across to a node of different version. The fix is to restore all existing request headers during the threadContext rewriting. However, there are headers that are always automatically preserved by the ThreadContext infrastructure, e.g. x-opaque-id. This causes failures when the code tries to re-add the x-opaque-id header since it already exists. An example of this issue is for CCS where the remote cluster is often on a different version compared to the local cluster. Resolves: elastic#79412
ywangd
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Failure is unrelated but reproducible locally. I raised #79986 |
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@elasticsearchmachine run elasticsearch-ci/part-1 |
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@elasticsearchmachine update branch |
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@elasticmachine update branch |
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Backports the following commits to 8.0: