Merge branch '461874-make-aggregation-calls-directly-to-es-client' into 'master'

Refactor aggregations calls for issues

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/157523



Merged-by: Dmitry Gruzd <dgruzd@gitlab.com>
Approved-by: Dmitry Gruzd <dgruzd@gitlab.com>
Reviewed-by: Arturo Herrero <arturo.herrero@gmail.com>
Reviewed-by: Terri Chu <tchu@gitlab.com>
Co-authored-by: Terri Chu <tchu@gitlab.com>