This change also slightly modifies the stats response,
so that is can easier consumer by monitoring and other
users. (coordinators stats are now in a list instead of
a map and has an additional field for the node id)
Relates to #32789
The test for now tests the enrich APIs in a multi node environment.
Picked EsIntegTestCase test over a real qa module in order to avoid
adding another module that starts a test cluster.
move put policy api yaml test to this rest module.
The main benefit is that all tests will then be run when running:
`./gradlew -p x-pack/plugin/enrich check`
The rest qa module starts a node with default distribution and basic
license.
This qa module will also be used for adding different rest tests (not yaml),
for example rest tests needed for #41532
Also when we are going to work on security integration then we can
add a security qa module under the qa folder. Also at some point
we should add a multi node qa module.
Martijn van Groningen