[7.x] Make data.search.aggs available on the server. (#74472)

[lukeelmers]

Backports the following commits to 7.x:

• Make data.search.aggs available on the server. (Make data.search.aggs available on the server. #74472)

[kibanamachine]

💚 Build Succeeded

• continuous-integration/kibana-ci/pull-request
• Commit: 6e2367f

Build metrics

@kbn/optimizer bundle module count

id	value	diff	baseline
data	541	+4	537

page load bundle size

id	value	diff	baseline
data	1.4MB	+29.1KB	1.4MB

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@elasticmachine merge upstream