Add elasticsearch_capture_body_urls option

[felixbarny]

Refs: elastic/apm-agent-nodejs#2019
Closes: #665

We're only expecting to implement this in the Node.js agent in the near future.
Other agents may add this to their roadmap as they see fit but we won't create a cross-agent tracking issue.

• May the instrumentation collect sensitive information, such as secrets or PII (ex. in headers)?
  • Yes
    • Add a section to the spec how agents should apply sanitization (such as sanitize_field_names) We're only capturing the request body for search requests by default to minimize the risk. Users can also add a custom ingest node pipeline to parse and redact JSON if needed.
  • No
    • Why?
  • n/a
• Create PR as draft
• Approval by at least one other agent
• Mark as Ready for Review (automatically requests reviews from all agents and PM via CODEOWNERS)
  • Remove PM from reviewers if impact on product is negligible
  • Remove agents from reviewers if the change is not relevant for them
• Approved by at least 2 agents + PM (if relevant)
• Merge after 7 days passed without objections
• Create implementation issues through the meta issue template (this will automate issue creation for individual agents)

/schedule 2022-08-18

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• Start Time: 2022-08-16T11:14:28.625+0000

• Duration: 3 min 55 sec

[danielmitterdorfer]

Thanks for quick update! LGTM

[trentm]

Thanks for starting this Felix!

[trentm]

Closes elastic/apm-agent-nodejs#2019 and #665

@felixbarny Are you okay with me changing that "Closes" to "Refs", so that the former issue isn't actually closed when this spec goes in? The issue should be closed when we implement the spec.

Update:

Oh, actually, I think what's wanted is:

Refs: https://github.com/elastic/apm-agent-nodejs/issues/2019
Closes: #665

[felixbarny]

As this affects all agents at least in the way the default behaves, I have created implementation issues for all agents and I'm waiting two more days for objections.