[APM] docs: Update setup page and remove index pat docs (#120025)

docs/apm/api.asciidoc

@@ -10,7 +10,6 @@ Some APM app features are provided via a REST API:
 
 * <<agent-config-api>>
 * <<apm-annotation-api>>
-* <<kibana-api,Kibana API>>
 * <<rum-sourcemap-api>>
 
 [float]
@@ -71,6 +70,13 @@ curl -X POST \
     }'
 ----
 
+[float]
+[[kibana-api]]
+=== Kibana API
+
+In addition to the APM specific API endpoints, Kibana provides its own <<api,REST API>>
+which you can use to automate certain aspects of configuring and deploying Kibana.
+
 ////
 *******************************************************
 *******************************************************
@@ -474,90 +480,6 @@ curl -X POST \
 *******************************************************
 ////
 
-[[kibana-api]]
-=== Kibana API
-
-In addition to the APM specific API endpoints, Kibana provides its own <<api,REST API>>
-which you can use to automate certain aspects of configuring and deploying Kibana.
-An example is below.
-
-[[api-create-apm-index-pattern]]
-==== Customize the APM index pattern
-
-Use Kibana's <<saved-objects-api-update,update object API>> to update the default APM index pattern on the fly.
-
-The following example sets the default APM app index pattern to `some-other-pattern-*`:
-
-[source,sh]
-----
-curl -X PUT "localhost:5601/api/saved_objects/index-pattern/apm_static_index_pattern_id" \ <1>
--H 'Content-Type: application/json' \
--H 'kbn-xsrf: true' \
--H 'Authorization: Basic ${YOUR_AUTH_TOKEN}' \
--d' {
-      "attributes": {
-        "title": "some-other-pattern-*", <2>
-      }
-    }'
-----
-<1> `apm_static_index_pattern_id` is the internal, hard-coded ID of the APM index pattern.
-This value should not be changed
-<2> Your custom index pattern matcher.
-
-The API returns the following:
-
-[source,json]
-----
-{
-   "id":"apm_static_index_pattern_id",
-   "type":"index-pattern",
-   "updated_at":"2020-07-06T22:55:59.555Z",
-   "version":"WzYsMV0=",
-   "attributes":{
-      "title":"some-other-pattern-*"
-   }
-}
-----
-
-To view the new APM app index pattern, use the <<saved-objects-api-get,GET object API>>:
-
-[source,sh]
-----
-curl -X GET "localhost:5601/api/saved_objects/index-pattern/apm_static_index_pattern_id" \ <1>
--H 'kbn-xsrf: true' \
--H 'Authorization: Basic ${YOUR_AUTH_TOKEN}'
-----
-<1> `apm_static_index_pattern_id` is the internal, hard-coded ID of the APM index pattern.
-
-The API returns the following:
-
-[source,json]
-----
-{
-  "id":"apm_static_index_pattern_id",
-  "type":"index-pattern",
-  "updated_at":"2020-07-06T22:55:59.555Z",
-  "version":"WzYsMV0=",
-  "attributes":{...}
-    "fieldFormatMap":"{...}
-    "fields":"[{...},{...},...]
-    "sourceFilters":"[{\"value\":\"sourcemap.sourcemap\"}]",
-    "timeFieldName":"@timestamp",
-    "title":"some-other-pattern-*"
-   },
-   ...
-}
-----
-
-// More examples will go here
-
-More information on Kibana's API is available in <<api,REST API>>.
-
-////
-*******************************************************
-*******************************************************
-////
-
 [role="xpack"]
 [[rum-sourcemap-api]]
 === RUM source map API

docs/apm/set-up.asciidoc

@@ -8,28 +8,13 @@
 
 APM is available via the navigation sidebar in {Kib}.
 If you have not already installed and configured Elastic APM,
-the *Add data* page will get you started.
+follow the three steps on the *Add data* page to get started:
+
+. Start APM Server
+. Add APM agents
+. Load Kibana objects
 
 [role="screenshot"]
 image::apm/images/apm-setup.png[Installation instructions on the APM page in Kibana]
 
-[float]
-[[apm-configure-index-pattern]]
-=== Load the index pattern
-
-Index patterns tell {kib} which {es} indices you want to explore.
-An APM index pattern is necessary for certain features in the APM app, like the query bar.
-To set up the correct index pattern, on the *Add data* page, click *Load Kibana objects*.
-
-[role="screenshot"]
-image::apm/images/apm-index-pattern.png[Setup index pattern for APM in Kibana]
-
-TIP: To use a custom index pattern,
-adjust Kibana's <<apm-settings-in-kibana,settings>> or use the <<api-create-apm-index-pattern,Kibana API>>.
-
-[float]
-[[apm-getting-started-next]]
-=== Next steps
-
-No further configuration in the APM app is required.
-Install an APM Agent library in your service to begin visualizing and analyzing your data!
+That's it! You're now ready to explore your data.

docs/settings/apm-settings.asciidoc

@@ -101,6 +101,8 @@ Changing these settings may disable features of the APM App.
 | `xpack.apm.indices.sourcemap` {ess-icon}
   | Matcher for all source map indices. Defaults to `apm-*`.
 
+| `xpack.apm.autocreateApmIndexPattern` {ess-icon}
+  | Set to `false` to disable the automatic creation of the APM index pattern when the APM app is opened. Defaults to `true`.
 |===
 
 // end::general-apm-settings[]