Preserve request headers in a mixed version cluster (#79412) #79441
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When rewriting authentication for requests crossing nodes of different versions, we now preserve all request headers except the authentication one which needs to be rewritten. Previously all other request headers were dropped and it caused issue like an operator user not being recognised on the remote node. Other now preserved headers include audit and system index access. This new behaviour is more correct because we would never drop these headers if the nodes are on the same version. Resolves: elastic#79354
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When rewriting authentication for requests crossing nodes of different
versions, we now preserve all request headers except the authentication
one which needs to be rewritten. Previously all other request headers
were dropped and it caused issue like an operator user not being
recognised on the remote node. Other now preserved headers include audit
and system index access. This new behaviour is more correct because we
would never drop these headers if the nodes are on the same version.
Resolves: #79354