In 5.4.x, the datafeed attempts to get all fields from
doc_values by default. It has a `_source` parameter which
when enabled changes the strategy to instead try to get
all fields from the source.
This has been the most common issue users have been
reporting as it means the datafeed will fail to fetch
any text fields by default.
This change uses the field capabilities API in order
to automatically detect whether a field is aggregatable.
It then extracts such fields from doc_values while the
rest are taken from source. The change also adds
validation to the start datafeed action so that if
fields are missing mappings or the time field is not
aggregatable we respond with an appropriate error.
relates elastic/x-pack-elasticsearch#1649
Original commit: elastic/x-pack-elasticsearch@76e2cc6cb2
* Changed ML action names to allow distinguishing of admin and read-only actions
using wildcards
* Added manage_ml and monitor_ml built-in privileges as subsets of the existing
manage and monitor privileges
* Added out-of-the-box machine_learning_admin and machine_learning_user roles
* Changed machine learning results endpoints to use a NodeClient rather than an
InternalClient when searching for results so that index/document level permissions
applied to ML results are respected
Original commit: elastic/x-pack-elasticsearch@eee800aaa8
Dimitris Athanasiou
David Roberts