[DOCS] Update ILM docs to use composable index templates (#60323)

Author: jrodewig

docs/reference/ilm/ilm-tutorial.asciidoc

@@ -294,7 +294,7 @@ as expected.
 
 [discrete]
 [[ilm-gs-alias-apply-policy]]
-=== Create a legacy index template to apply the lifecycle policy
+=== Create an index template to apply the lifecycle policy
 
 To automatically apply a lifecycle policy to the new write index on rollover,
 specify the policy in the index template used to create new indices.
@@ -310,24 +310,26 @@ that match the index pattern.
 when the rollover action is triggered for an index.
 
 You can use the {kib} Create template wizard to add the template. To access the
-wizard, open the menu, go to *Stack Management > Index Management*, and click
-the *Index Templates* tab.
+wizard, open the menu and go to *Stack Management > Index Management*. In the
+the *Index Templates* tab, click *Create template*.
 
 [role="screenshot"]
-image:images/ilm/create-template-wizard.png[]
+image:images/ilm/create-template-wizard.png[Create template page]
 
 The create template request for the example template looks like this:
 
 [source,console]
 -----------------------
-PUT _template/timeseries_template
+PUT _index_template/timeseries_template
 {
   "index_patterns": ["timeseries-*"],                 <1>
-  "settings": {
-    "number_of_shards": 1,
-    "number_of_replicas": 1,
-    "index.lifecycle.name": "timeseries_policy",      <2>
-    "index.lifecycle.rollover_alias": "timeseries"    <3>
+  "template": {
+    "settings": {
+      "number_of_shards": 1,
+      "number_of_replicas": 1,
+      "index.lifecycle.name": "timeseries_policy",      <2>
+      "index.lifecycle.rollover_alias": "timeseries"    <3>
+    }
   }
 }
 -----------------------
@@ -342,7 +344,7 @@ Required for policies that use the rollover action.
 
 [source,console]
 --------------------------------------------------
-DELETE /_template/timeseries_template
+DELETE _index_template/timeseries_template
 --------------------------------------------------
 // TEST[continued]
 

docs/reference/ilm/ilm-with-existing-indices.asciidoc

@@ -98,28 +98,30 @@ to the document ID.
 //////////////////////////
 [source,console]
 -----------------------
-PUT _template/mylogs_template
+PUT _index_template/mylogs_template
 {
   "index_patterns": [
     "mylogs-*"
   ],
-  "settings": {
-    "number_of_shards": 1,
-    "number_of_replicas": 1,
-    "index": {
-      "lifecycle": {
-        "name": "mylogs_condensed_policy", <2>
-        "rollover_alias": "mylogs" <3>
+  "template": {
+    "settings": {
+      "number_of_shards": 1,
+      "number_of_replicas": 1,
+      "index": {
+        "lifecycle": {
+          "name": "mylogs_condensed_policy", <2>
+          "rollover_alias": "mylogs" <3>
+        }
       }
-    }
-  },
-  "mappings": {
-    "properties": {
-      "message": {
-        "type": "text"
-      },
-      "@timestamp": {
-        "type": "date"
+    },
+    "mappings": {
+      "properties": {
+        "message": {
+          "type": "text"
+        },
+        "@timestamp": {
+          "type": "date"
+        }
       }
     }
   }
@@ -148,7 +150,7 @@ POST mylogs-pre-ilm-2019.06.25/_doc
 
 [source,console]
 --------------------------------------------------
-DELETE _template/mylogs_template
+DELETE _index_template/mylogs_template
 --------------------------------------------------
 // TEST[continued]
 

docs/reference/ilm/set-up-lifecycle-policy.asciidoc

@@ -76,11 +76,12 @@ To use a policy that triggers the rollover action,
 you need to configure the policy in the index template used to create each new index.
 You specify the name of the policy and the alias used to reference the rolling indices.
 
-To use the Create template wizard to create a template from {kib} Management,
-go to Management, click **Index Management** and select the **Index Templates** view.
+You can use the {kib} Create template wizard to create a template. To access the
+wizard, open the menu and go to *Stack Management > Index Management*. In the
+the *Index Templates* tab, click *Create template*.
 
 [role="screenshot"]
-image:images/ilm/create-template-wizard.png[]
+image:images/ilm/create-template-wizard-my_template.png[Create template page]
 
 The wizard invokes the <<indices-put-template,put template API>> to add templates to a cluster.
 
@@ -89,14 +90,16 @@ The wizard invokes the <<indices-put-template,put template API>> to add template
 ====
 [source,console]
 -----------------------
-PUT _template/my_template
+PUT _index_template/my_template
 {
   "index_patterns": ["test-*"], <1>
-  "settings": {
-    "number_of_shards": 1,
-    "number_of_replicas": 1,
-    "index.lifecycle.name": "my_policy", <2>
-    "index.lifecycle.rollover_alias": "test-alias" <3>
+  "template": {
+    "settings": {
+      "number_of_shards": 1,
+      "number_of_replicas": 1,
+      "index.lifecycle.name": "my_policy", <2>
+      "index.lifecycle.rollover_alias": "test-alias" <3>
+    }
   }
 }
 -----------------------
@@ -109,7 +112,7 @@ PUT _template/my_template
 
 [source,console]
 --------------------------------------------------
-DELETE /_template/my_template
+DELETE _index_template/my_template
 --------------------------------------------------
 // TEST[continued]
 
@@ -197,22 +200,24 @@ WARNING: Be careful that you don't inadvertently match indices that you don't wa
 //////////////////////////
 [source,console]
 -----------------------
-PUT _template/mylogs_template
+PUT _index_template/mylogs_template
 {
   "index_patterns": [
     "mylogs-*"
   ],
-  "settings": {
-    "number_of_shards": 1,
-    "number_of_replicas": 1
-  },
-  "mappings": {
-    "properties": {
-      "message": {
-        "type": "text"
-      },
-      "@timestamp": {
-        "type": "date"
+  "template": {
+    "settings": {
+      "number_of_shards": 1,
+      "number_of_replicas": 1
+    },
+    "mappings": {
+      "properties": {
+        "message": {
+          "type": "text"
+        },
+        "@timestamp": {
+          "type": "date"
+        }
       }
     }
   }
@@ -241,7 +246,7 @@ POST mylogs-pre-ilm-2019.06.25/_doc
 
 [source,console]
 --------------------------------------------------
-DELETE _template/mylogs_template
+DELETE _index_template/mylogs_template
 --------------------------------------------------
 // TEST[continued]