[Infra] Remove additional indexFields related functions

[jennypavlova]

Relates to #180690

Summary

This PR is a follow-up to #189541 and removes additional functions related to the indexFields that are no longer needed

Testing

Check metricIndicesExist and remoteClustersExist in the request by changing the settings (in the first video I use metricbeat and no oblt cluster and in the second one I am connected to oblt cluster)

no_cluster.mov

with_remote_cluster.mov

[jennypavlova]

/ci

[obltmachine]

🤖 GitHub comments

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Just comment with:

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

[elasticmachine]

Pinging @elastic/obs-ux-infra_services-team (Team:obs-ux-infra_services)

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 109e4f5

Metrics [docs]

✅ unchanged

History

• 💚 Build #225260 succeeded d75bb75

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

cc @jennypavlova

[crespocarlos]

LGTM:

before this change:

After:

Source endpoint response size will now be stable, not being affected by the number of fields the indices have, and small

Thanks for this change!