updated correct API to get index templates etc (elastic#93793)

* updated correct API to get index templates etc

Hi, I think documentation needs correction on below points.
1. updated correct API to get index template
2.  on line 18, it should be index pattern instead of template pattern
3.  index pattern should have es version as 8 which matches elasticsearch version, also updated index patterns in API request payload

* fix: grammatical correction to line 18

removed "the" from line 18 which is not very accuarate

Co-authored-by: Abdon Pijpelink <[email protected]>

* additional corrections to the docs as suggested by @abdonpijpelink

. use the `_index_template` endpoint instead of just `_template`
. change `order` to `priority`

* settings need to be wrapped inside template obect

---------

Co-authored-by: Abdon Pijpelink <[email protected]>

Author: 2 people

docs/reference/monitoring/indices.asciidoc

@@ -9,15 +9,15 @@ You can retrieve the templates through the `_template` API:
 
 [source,console]
 ----------------------------------
-GET /_template/.monitoring-*
+GET /_index_template/.monitoring-es-mb*
 ----------------------------------
 
 By default, the template configures one shard and one replica for the
 monitoring indices. To override the default settings, add your own template:
 
-. Set the `template` patterns to match existing `.monitoring-{product}-7-*` indices.
-. Set the template `order` to `1`. This ensures your template is
-applied after the default template, which has an order of 0.
+. Set `index_patterns` to match existing `.monitoring-{product}-8-*` indices.
+. Set the template `priority` to `1`. This ensures your template is
+applied after the default template, which has an priority of 0.
 . Specify the `number_of_shards` and/or `number_of_replicas` in the `settings`
 section.
 
@@ -26,22 +26,29 @@ and the number of replicas to two.
 
 [source,console]
 ----------------------------------
-PUT /_template/custom_monitoring
+PUT /_index_template/custom_monitoring
 {
-  "index_patterns": [".monitoring-beats-7-*", ".monitoring-es-7-*", ".monitoring-kibana-7-*", ".monitoring-logstash-7-*"],
-  "order": 1,
-  "settings": {
-    "number_of_shards": 5,
-    "number_of_replicas": 2
-  }
+  "index_patterns": [
+  ".monitoring-beats-8-*",
+  ".monitoring-es-8-*",
+  ".monitoring-kibana-8-*",
+  ".monitoring-logstash-8-*"
+  ],
+  "priority": 1,
+  "template": {
+    "settings": {
+      "number_of_shards": 5,
+      "number_of_replicas": 2
+    }
+  } 
 }
 ----------------------------------
 
 //////////////////////////
 
 [source,console]
 --------------------------------------------------
-DELETE /_template/custom_monitoring
+DELETE /_index_template/custom_monitoring
 --------------------------------------------------
 // TEST[continued]