Split the .kibana saved objects index into multiple indices

[gsoldevila]

Test

[gsoldevila]

Closed in favor of #154888
(we want to trigger a build for dot-kibana-split of elastic repo)

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 3bd278d

Metrics [docs]

Public APIs missing comments

Total count of every public API that lacks a comment. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats comments for more detailed information.

id	before	after	diff
@kbn/core-saved-objects-migration-server-internal	85	87	+2
@kbn/core-saved-objects-server	99	100	+1
total			+3

Public APIs missing exports

Total count of every type that is part of your API that should be exported but is not. This will cause broken links in the API documentation system. Target amount is 0. Run node scripts/build_api_docs --plugin [yourplugin] --stats exports for more detailed information.

id	before	after	diff
@kbn/core-saved-objects-base-server-internal	8	9	+1

Unknown metric groups

API count

id	before	after	diff
@kbn/core-saved-objects-migration-server-internal	120	122	+2
@kbn/core-saved-objects-server	493	494	+1
total			+3

ESLint disabled line counts

id	before	after	diff
securitySolution	433	436	+3

Total ESLint disabled count

id	before	after	diff
securitySolution	512	515	+3

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