[Index Patterns] Runtime fields CRUD REST API

[Dosant]

Summary

close #92126

Mostly follows scripted fields REST API structure.

• Create a new runtime field — POST /api/index_patterns/index_pattern/{id}/runtime_field
• Get a runtime field — GET /api/index_patterns/index_pattern/{id}/runtime_field/{name}
• Update a an existing runtime field — POST /api/index_patterns/index_pattern/{id}/runtime_field/{name}
• Upsert a runtime field — PUT /api/index_patterns/index_pattern/{id}/runtime_field
• Delete a runtime field — DELETE /api/index_patterns/index_pattern/{id}/runtime_field/{name}

TODO

• User facing docs
• Do we want this API to support updating customLabel, fieldFormatters, and popularity? Or separate field API should work for now. - to keep API surface minimal, recommend updating those using separate existing API endpoint. Added integration test to make sure it works in combination with new API
• Want to learn more about isMapped. Also could it be that regular field is augmented by runtime field property? [Index Patterns] Runtime fields CRUD REST API  #101164 (comment)

Checklist

• Documentation was added for features that require explanation or tutorials
• Unit or functional tests were updated or added to match the most common scenarios

For maintainers

• This was checked for breaking API changes and was labeled appropriately

Release Notes

Adds runtime fields CRUD REST API

[mattkime]

isMapped exists to tell the difference between shadow runtime fields and regular runtime fields. That said, shadow runtime fields aren't implemented yet.

[elasticmachine]

Pinging @elastic/kibana-app-services (Team:AppServices)

[mattkime]

Great work, thanks!

[Dosant]

@elasticmachine merge upstream

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: a7783f6
• Storybooks Preview
• Documentation Changes

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
data	3257	3266	+9

Page load bundle

Size of the bundles that are downloaded on every page load. Target size is below 100kb

id	before	after	diff
data	839.7KB	840.0KB	+364.0B

Unknown metric groups

API count

id	before	after	diff
data	3809	3827	+18

History

• 💔 Build #130063 failed 49fcfba
• 💚 Build #129861 succeeded d5d2eae
• 💚 Build #129808 succeeded bb796f4
• 💚 Build #128656 succeeded 20e3668
• 💔 Build #128648 failed 11fe061

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