[DOCS] Adds progress parameter description to the GET stats data fram…

…e analytics API doc. (elastic#46434)

docs/reference/ml/df-analytics/apis/get-dfanalytics-stats.asciidoc

@@ -24,13 +24,15 @@ experimental[]
 
 `GET _ml/data_frame/analytics/*/_stats`
 
+
 [[ml-get-dfanalytics-stats-prereq]]
 ==== {api-prereq-title}
 
 * You must have `monitor_ml` privilege to use this API. For more 
 information, see {stack-ov}/security-privileges.html[Security privileges] and 
 {stack-ov}/built-in-roles.html[Built-in roles].
 
+
 [[ml-get-dfanalytics-stats-path-params]]
 ==== {api-path-parms-title}
 
@@ -39,6 +41,7 @@ information, see {stack-ov}/security-privileges.html[Security privileges] and
   one of these options, the API returns information for the first hundred
   {dfanalytics-jobs}.
 
+
 [[ml-get-dfanalytics-stats-query-params]]
 ==== {api-query-parms-title}
 
@@ -64,6 +67,7 @@ when there are no matches or only partial matches.
   (Optional, integer) Specifies the maximum number of {dfanalytics-jobs} to
   obtain. The default value is `100`.
 
+
 [[ml-get-dfanalytics-stats-response-body]]
 ==== {api-response-body-title}
 
@@ -72,6 +76,24 @@ The API returns the following information:
 `data_frame_analytics`::
   (array) An array of statistics objects for {dfanalytics-jobs}, which are
   sorted by the `id` value in ascending order.
+
+  `id`::
+    (string) The unique identifier of the {dfanalytics-job}.
+
+  `state`::
+    (string) Current state of the {dfanalytics-job}.
+
+  `progress`::
+    (array) The progress report of the {dfanalytics-job} by phase.
+
+    `phase`::
+      (string) Defines the phase of the {dfanalytics-job}. Possible phases: 
+      `reindexing`, `loading_data`, `analyzing`, and `writing_results`.
+
+    `progress_percent`::
+      (integer) The progress that the {dfanalytics-job} has made expressed in 
+      percentage.
+
 
 [[ml-get-dfanalytics-stats-response-codes]]
 ==== {api-response-codes-title}
@@ -80,6 +102,7 @@ The API returns the following information:
   If `allow_no_match` is `false`, this code indicates that there are no
   resources that match the request or only partial matches for the request.
 
+
 [[ml-get-dfanalytics-stats-example]]
 ==== {api-examples-title}
 
@@ -90,6 +113,7 @@ GET _ml/data_frame/analytics/loganalytics/_stats
 // CONSOLE
 // TEST[skip:TBD]
 
+
 The API returns the following results:
 
 [source,js]