Under most of the customHeaders configuration #8095
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There's a bug with the elasticsearch customHeader configuration logic in
the hapi proxy that causes issues when elasticsearch is behind ssl but
Kibana is not, which is a common situation when there's a reverse proxy
in front of Kibana that is doing ssl termination.
Rather than revert all of the changes in that entire commit, this simply
undoes the custom header logic to the proxy itself and removes the
public documentation for it since the feature isn't particularly useful
in this form.
The original configurable header backport PR is #8032
Fixes #8093