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
* [DOCS] Review of close job and job stats
* [DOCS] Add force close
* [DOCS] Remove invalid params from get records
* [DOCS] Remove invalid params from get buckets
* [DOCS] Job resource corrections
Original commit: elastic/x-pack-elasticsearch@bc68d05097