out_es: custom http headers

[AndrewChubatiuk]

Added docs for custom Elasticsearch output custom HTTP headers

[esmerel]

I fixed the merge conflict, this should be ok to go if/when the appropriate code merges.

[eschabell]

@AndrewChubatiuk just fyi I've nudged the corresponding code PR fluent/fluent-bit#9416 for a review to hopefully move both the docs and code changes forward.

[patrick-stephens]

Can we add some examples particularly with multiple headers so people can see - what types of headers would be common here?

[eschabell]

@AndrewChubatiuk resolved your conflicts.

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• pipeline/outputs/elasticsearch.md

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[eschabell]

@AndrewChubatiuk just waiting on code PR merging.