Cherry-pick #18327 to 7.x: [Heartbeat] Capture HTTP headers #19057
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Cherry-pick of PR #18327 to 7.x branch. Original message:
Provides progress toward: elastic/uptime#190
Captures HTTP headers and stores them in the response in the same manner
as APM Server, using canonical header names in
http.response.headers
.Values are not indexed, just stored, in ES.
Checklist
CHANGELOG.next.asciidoc
orCHANGELOG-developer.next.asciidoc
.Author's Checklist
How to test this PR locally
Run the default config