[Fleet] making service_token an output secret

[juliaElastic]

Summary

Related to #104986

Making remote ES output's service_token a secret.

fleet-server change here: elastic/fleet-server#3051 (comment)

Steps to verify:

• Enable remote ES output and output secrets in kibana.dev.yml locally:

xpack.fleet.enableExperimental: ['remoteESOutput', 'outputSecretsStorage']

• Start es, kibana, fleet-server locally and start a second es locally
• see detailed steps here: Support for remote ES output fleet-server#3051
• Create a remote ES output, verify that the service_token is stored as a secret reference

GET .kibana_ingest/_search?q=type:ingest-outputs

• Verify that the enrolled agent sends data to the remote ES successfully

Checklist

• Unit or functional tests were updated or added to match the most common scenarios

[apmmachine]

🤖 GitHub comments

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
• /oblt-deploy-serverless : Deploy a serverless Kibana instance using the Observability test environments.
• run elasticsearch-ci/docs : Re-trigger the docs validation. (use unformatted text in the comment!)

[jloleysens]

Core changes LGTM on the basis that service_token.id is going to be used in search.

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 19e0817

Metrics [docs]

Async chunks

Total size of all lazy-loaded chunks that will be downloaded as the user navigates the app

id	before	after	diff
fleet	1.2MB	1.2MB	+885.0B

History

• 💛 Build #179212 was flaky 75dae6b
• 💚 Build #179042 succeeded 9e8d2b6
• 💔 Build #179022 failed 878a921
• 💔 Build #179006 failed 8789eb6
• 💔 Build #178996 failed 008c4f8
• 💔 Build #178595 failed dc0652a

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @juliaElastic

[kpollich]

Code + tests LGTM 🚀

[juliaElastic]

Hi @elastic/platform-docs team, it looks like you are code owners, could you review please?

[kilfoyle]

LGTM!

[pgayvallet]

FYI, the SO mapping addition done is this PR was done incorrectly. A new model version should have been added at the same time.

I will fix it in #172056

[juliaElastic]

FYI, the SO mapping addition done is this PR was done incorrectly. A new model version should have been added at the same time.

I will fix it in #172056

Thanks for fixing!