* Allow internal datalinks for elastic

* Add docs

* Update docs/sources/features/datasources/elasticsearch.md

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>

Co-authored-by: Diana Payton <52059945+oddlittlebird@users.noreply.github.com>