* [DOCS] Add ML analytical functions
* [DOCS] Add pages for ML analytical functions
* [DOCS] Add links to ML functions from API definitions
Original commit: elastic/x-pack-elasticsearch@ae50b431d3
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