Elasticsearch client: no longer default to using meta: true (#124488)

* Use `Client` interface instead of `KibanaClient`

* get rid of getKibanaEsClient and convertToKibanaClient

* get rid of last KibanaClient usages

* update usages and types in @kbn/securitysolution-es-utils

* fix some violations

* add sugar method around client mock

* update SO repository calls

* adapt more core usages

* export mock types

* batch 1

* batch 2

* batch 3

* batch 4

* batch 5

* batch 6

* batch 7

* batch 8

* batch 9

* security - batch 1

* security - batch 2

* security - batch 3

* last batch of initial violations

* fix resolve_time_pattern

* update generated doc

* fix /internal/index-pattern-management/preview_scripted_field endpoint

* fix monitoring's getLegacyClusterShim

* fix /api/snapshot_restore/privileges route

* fix UptimeESClient

* fix transforms/_nodes endpoint

* lint

* unit test fix - batch 1

* unit test fix - batch 2

* unit test fix - batch 3

* integration test fix - batch 1

* lint

* adapt ML client

* unit test fix - batch 4

* fix uptime test helper

* fix /api/transform/transforms/{transformId}/_update route

* fix ES client FTR test

* fix uptime unit test

* fix type errors on last unit tests

* fix RollupSearchStrategy call

* fix /internal/security/fields/{query} route

* fix GET /api/index_lifecycle_management/policies route

* fix mlClient.getDataFrameAnalytics

* fix APMEventClient

* fix security solution getBootstrapIndexExists

* fix data_enhanced's getSearchStatus

* remove unused @ts-expect-error

* fix unit tests due to latest code changes

* fix more calls in security_solution routes

* fix more calls in ml routes

* fix POST /api/index_management/component_templates route

* fix unit tests due to latest changes

* fix rule_registry's ResourceInstaller.createOrUpdateIndexTemplate

* fix more fleet client calls

* fix UA's GET cloud_backup_status route

* fix createLifecycleExecutorApiTest

* fix hasFleetServers

* fix unit tests due to latest changes

* changes due to last merge

* fix ml modelProvider.getModelsPipelines

* fix security_solution LifecycleQuery.search

* fix new CoreUsageDataService usage

* fix security solution's StatsQuery.search

* improve ml FTR assertions

* fix security_solution's EventsQuery.search

* fix EsClient type as we're keeping transport

* NITs

* clean RepositoryEsClient type

* update generated doc

* review comments

* adapt mlClient.anomalySearch signature

* remove unnecessary .then((body) => body)

* nit

* add unit tests for the client mocking functions

* fix new upgrade assistant /remote_clusters endpoint

examples/preboot_example/server/plugin.ts

@@ -114,7 +114,7 @@ export class PrebootExamplePlugin implements PrebootPlugin {
 
           try {
             return response.ok({
-              body: (await scopedClient.asCurrentUser.security.authenticate()).body,
+              body: await scopedClient.asCurrentUser.security.authenticate(),
             });
           } catch (err) {
             return response.customError({ statusCode: 500, body: getDetailedErrorMessage(err) });