[ML] Add docs for ML info endpoint

docs/reference/ml/apis/get-ml-info.asciidoc

@@ -0,0 +1,60 @@
+[role="xpack"]
+[testenv="platinum"]
+[[get-ml-info]]
+=== Get Machine Learning Info API
+++++
+<titleabbrev>Get Machine Learning Info</titleabbrev>
+++++
+
+Returns defaults and limits used by machine learning.
+
+==== Request
+
+`GET _xpack/ml/info`
+
+==== Description
+
+This endpoint is designed to be used by a user interface that needs to fully
+understand machine learning configurations where some options are not specified,
+meaning that the defaults should be used.  This endpoint may be used to find out
+what those defaults are.
+
+
+==== Authorization
+
+You must have `monitor_ml`, `monitor`, `manage_ml`, or `manage` cluster
+privileges to use this API.  The `machine_learning_admin` and `machine_learning_user`
+roles provide these privileges. For more information, see
+{stack-ov}/security-privileges.html[Security Privileges] and
+{stack-ov}/built-in-roles.html[Built-in Roles].
+
+
+==== Examples
+
+The endpoint takes no arguments:
+
+[source,js]
+--------------------------------------------------
+GET _xpack/ml/info
+--------------------------------------------------
+// CONSOLE
+// TEST
+
+This is a possible response:
+[source,js]
+----
+{
+  "defaults" : {
+    "anomaly_detectors" : {
+      "model_memory_limit" : "1gb",
+      "categorization_examples_limit" : 4,
+      "model_snapshot_retention_days" : 1
+    },
+    "datafeeds" : {
+      "scroll_size" : 1000
+    }
+  },
+  "limits" : { }
+}
+----
+// TESTRESPONSE

docs/reference/ml/apis/ml-api.asciidoc

@@ -76,6 +76,12 @@ machine learning APIs and in advanced job configuration options in Kibana.
 
 * <<ml-find-file-structure,Find file structure>>
 
+[float]
+[[ml-api-ml-info-endpoint]]
+=== Info
+
+* <<get-ml-info,Machine learning info>>
+
 //ADD
 include::post-calendar-event.asciidoc[]
 include::put-calendar-job.asciidoc[]
@@ -111,6 +117,7 @@ include::get-datafeed-stats.asciidoc[]
 include::get-influencer.asciidoc[]
 include::get-job.asciidoc[]
 include::get-job-stats.asciidoc[]
+include::get-ml-info.asciidoc[]
 include::get-snapshot.asciidoc[]
 include::get-calendar-event.asciidoc[]
 include::get-filter.asciidoc[]