Multi field terms

[flash1293]

Implements multi field terms agg config. Other bucket is supported, missing bucket is not.
Refactors common parts between terms and multi_terms into a common place.

To test the expression level:
Start node scripts/functional_tests_server.js --config test/interpreter_functional/config.ts
Go to the "Run pipeline app"
Do this in the console (check results and queries on the wire):

await window.runPipeline(`kibana_context timeRange={timerange from='2015-09-21T00:00:00Z' to='now+2y'}
          | esaggs index={indexPatternLoad id='90943e30-9a47-11e8-b64d-95841ca0b247'}
          aggs={aggMultiTerms id="0" enabled=true schema="bucket" fields="extension.keyword" fields="geo.dest" size=20 orderAgg={aggCount id="order" enabled=true schema="metric"}}
          aggs={aggCount id="1" enabled=true schema="metric"}`, null, {})

See test cases in https://github.com/elastic/kibana/pull/116928/files#diff-3113b5ed44b84abf6e4829a3bac5cd7982220cab058ff938defa26bef0ccb03b

[elasticmachine]

Pinging @elastic/kibana-vis-editors @elastic/kibana-vis-editors-external (Team:VisEditors)

[elasticmachine]

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

[dej611]

Code review for the @elastic/kibana-vis-editors files only 👍

[flash1293]

@elasticmachine merge upstream

[kibanamachine]

expected head sha didn’t match current head ref.

[flash1293]

@elasticmachine merge upstream

[kibanamachine]

merge conflict between base and head

[flash1293]

@elasticmachine merge upstream

[flash1293]

@elasticmachine merge upstream

[kibana-ci]

💚 Build Succeeded

• Buildkite Build
• Commit: 46ba8ed
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Metrics [docs]

Module Count

Fewer modules leads to a faster build time

id	before	after	diff
data	500	505	+5

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	2853	2866	+13

Page load bundle

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

id	before	after	diff
data	431.9KB	438.0KB	+6.1KB
visTypeMetric	8.7KB	8.7KB	+15.0B
visTypePie	13.7KB	13.7KB	+30.0B
visTypeVislib	19.7KB	19.7KB	+75.0B
visTypeXy	39.7KB	39.9KB	+180.0B
total			+6.4KB

Unknown metric groups

API count

id	before	after	diff
data	3245	3258	+13

References to deprecated APIs

id	before	after	diff
data	463	475	+12

History

• 💚 Build #8291 succeeded 26a3886
• 💚 Build #7426 succeeded df92ab3
• 💚 Build #6602 succeeded 9ef5e19
• 💔 Build #6368 failed 84ceb82
• 💔 Build #5832 failed 6a446ce
• 💔 Build #4428 failed 50df207

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

[ppisljar]

app services code LGTM