[ML] adding delayed_data_check_config to datafeed update docs (#42095) (#42626)

* [ML] adding delayed_data_check_config to datafeed update docs

* [DOCS] Edits delayed data configuration details

docs/reference/ml/apis/datafeedresource.asciidoc

@@ -61,12 +61,12 @@ A {dfeed} resource has the following properties:
 
 `delayed_data_check_config`::
   (object) Specifies whether the data feed checks for missing data and 
-  and the size of the window. For example:
+  the size of the window. For example:
   `{"enabled": true, "check_window": "1h"}` See
   <<ml-datafeed-delayed-data-check-config>>.
 
 [[ml-datafeed-chunking-config]]
-==== Chunking Configuration Objects
+==== Chunking configuration objects
 
 {dfeeds-cap} might be required to search over long time periods, for several months
 or years. This search is split into time chunks in order to ensure the load
@@ -88,31 +88,33 @@ A chunking configuration object has the following properties:
   For example: `3h`.
 
 [[ml-datafeed-delayed-data-check-config]]
-==== Delayed Data Check Configuration Objects
+==== Delayed data check configuration objects
 
 The {dfeed} can optionally search over indices that have already been read in
-an effort to find if any data has since been added to the index. If missing data
+an effort to determine whether any data has subsequently been added to the index.
-is found, it is a good indication that the `query_delay` option is set too low and
+If missing data is found, it is a good indication that the `query_delay` option
-the data is being indexed after the {dfeed} has passed that moment in time. See 
+is set too low and the data is being indexed after the {dfeed} has passed that
+moment in time. See 
 {stack-ov}/ml-delayed-data-detection.html[Working with delayed data].
 
-This check only runs on real-time {dfeeds}
+This check runs only on real-time {dfeeds}.
 
 The configuration object has the following properties:
 
 `enabled`::
-  (boolean) Should the {dfeed} periodically check for data being indexed after reading.
+  (boolean) Specifies whether the {dfeed} periodically checks for delayed data.
-  Defaults to `true`
+  Defaults to `true`.
 
 `check_window`::
-  (time units) The window of time before the latest finalized bucket that should be searched
+  (time units) The window of time that is searched for late data. This window of
-  for late data. Defaults to `null` which causes an appropriate `check_window` to be calculated
+  time ends with the latest finalized bucket. It defaults to `null`, which
-  when the real-time {dfeed} runs.
+  causes an appropriate `check_window` to be calculated when the real-time
-  The default `check_window` span calculation is the max between `2h` or `8 * bucket_span`.
+  {dfeed} runs. In particular, the default `check_window` span calculation is
+  based on the maximum of `2h` or `8 * bucket_span`.
 
 [float]
 [[ml-datafeed-counts]]
-==== {dfeed-cap} Counts
+==== {dfeed-cap} counts
 
 The get {dfeed} statistics API provides information about the operational
 progress of a {dfeed}. All of these properties are informational; you cannot

docs/reference/ml/apis/put-datafeed.asciidoc

@@ -45,6 +45,11 @@ IMPORTANT:  You must use {kib} or this API to create a {dfeed}. Do not put a {df
   (object) Specifies how data searches are split into time chunks.
   See <<ml-datafeed-chunking-config>>.
 
+`delayed_data_check_config`::
+  (object) Specifies whether the data feed checks for missing data and 
+  the size of the window. See
+  <<ml-datafeed-delayed-data-check-config>>.
+
 `frequency`::
   (time units) The interval at which scheduled queries are made while the {dfeed}
   runs in real time. The default value is either the bucket span for short
@@ -82,10 +87,6 @@ IMPORTANT:  You must use {kib} or this API to create a {dfeed}. Do not put a {df
   (unsigned integer) The `size` parameter that is used in {es} searches.
   The default value is `1000`.
 
-`delayed_data_check_config`::
-  (object) Specifies if and with how large a window should the data feed check
-  for missing data. See <<ml-datafeed-delayed-data-check-config>>.
-
 For more information about these properties,
 see <<ml-datafeed-resource>>.
 

docs/reference/ml/apis/update-datafeed.asciidoc

@@ -14,7 +14,10 @@ Updates certain properties of a {dfeed}.
 
 `POST _ml/datafeeds/<feed_id>/_update`
 
-//===== Description
+===== Description
+
+NOTE: If you update the `delayed_data_check_config` property, you must stop and
+start the {dfeed} for the change to be applied.
 
 ==== Path Parameters
 
@@ -32,6 +35,10 @@ The following properties can be updated after the {dfeed} is created:
 `chunking_config`::
   (object) Specifies how data searches are split into time chunks.
   See <<ml-datafeed-chunking-config>>.
+  
+`delayed_data_check_config`::
+  (object) Specifies whether the data feed checks for missing data and 
+  the size of the window. See <<ml-datafeed-delayed-data-check-config>>.  
 
 `frequency`::
   (time units) The interval at which scheduled queries are made while the