* [DOCS] Update ML APIs for Elasticsearch Reference
* [DOCS] Add X-Pack icon for ML APIs
* [DOCS] Add role attribute to ML APIs
Original commit: elastic/x-pack-elasticsearch@997ea39759
* [DOCS] Edits for description of ML results resource
* [DOCS] Adds Authorization section to ML API pages
Original commit: elastic/x-pack-elasticsearch@797761e7ae
Adds a gradle build for documentation testing, partially stolen from the xpack meta repo. Updated to make work with the current setup
index.asciidoc was updated/enabled as a test, and various pre-existing tests appear to be working. There are a large number of tests still ignored due to missing proper // CONSOLE tags
Original commit: elastic/x-pack-elasticsearch@1d596f0be3
