Add combined 'Manage index templates' content (#455)

This aligns the serverless and stateful content for Manage data → The
Elasticsearch data store → Templates → Index management in the UI

I renamed the page to just "Manage index templates" since it's about
index templates only (not other index things) and the "in the UI" seems
kind of unnecessary.

See:
[preview](https://docs-v3-preview.elastic.dev/elastic/docs-content/pull/455/manage-data/data-store/templates/index-management-in-ui)
Closes: elastic/docs-projects#380

Author: kilfoyle

manage-data/data-store/templates/index-management-in-ui.md

@@ -0,0 +1,133 @@
+---
+mapped_urls:
+  - https://www.elastic.co/guide/en/elasticsearch/reference/current/index-mgmt.html#manage-index-templates
+  - https://www.elastic.co/guide/en/serverless/current/index-management.html#index-management-manage-index-templates
+applies:
+  stack: all
+  serverless: all
+  hosted: all
+---
+
+# Manage index templates [manage-index-templates]
+
+Create, edit, clone, and delete your index templates in the **Index Templates** view. Changes made to an index template do not affect existing indices.
+
+:::{image} ../../../images/elasticsearch-reference-management-index-templates.png
+:alt: Index templates
+:class: screenshot
+:::
+
+In {{serverless-full}}, the default **logs** template uses the logsDB index mode to create a [logs data stream](../index-types/logsdb.md).
+
+If you don’t have any templates, you can create one using the **Create template** wizard.
+
+### Try it: Create an index template [_try_it_create_an_index_template]
+
+In this tutorial, you’ll create an index template and use it to configure two new indices.
+
+**Step 1. Add a name and index pattern**
+
+1. In the **Index Templates** view, open the **Create template** wizard.
+
+    :::{image} ../../../images/elasticsearch-reference-management_index_create_wizard.png
+    :alt: Create wizard
+    :class: screenshot
+    :::
+
+2. In the **Name** field, enter `my-index-template`.
+3. Set **Index pattern** to `my-index-*` so the template matches any index with that index pattern.
+4. Leave **Data Stream**, **Priority**, **Version**, and **_meta field** blank or as-is.
+
+**Step 2. Add settings, mappings, and aliases**
+
+1. Add [component templates](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-cluster-put-component-template) to your index template.
+
+    Component templates are pre-configured sets of mappings, index settings, and aliases you can reuse across multiple index templates. Badges indicate whether a component template contains mappings (**M**), index settings (**S**), aliases (**A**), or a combination of the three.
+
+    Component templates are optional. For this tutorial, do not add any component templates.
+
+    :::{image} ../../../images/elasticsearch-reference-management_index_component_template.png
+    :alt: Component templates page
+    :class: screenshot
+    :::
+
+2. Define index settings. These are optional. For this tutorial, leave this section blank.
+3. Define a mapping that contains an [object](https://www.elastic.co/guide/en/elasticsearch/reference/current/object.html) field named `geo` with a child [`geo_point`](https://www.elastic.co/guide/en/elasticsearch/reference/current/geo-point.html) field named `coordinates`:
+
+    :::{image} ../../../images/elasticsearch-reference-management-index-templates-mappings.png
+    :alt: Mapped fields page
+    :class: screenshot
+    :::
+
+    Alternatively, you can click the **Load JSON** link and define the mapping as JSON:
+
+    ```js
+    {
+      "properties": {
+        "geo": {
+          "properties": {
+            "coordinates": {
+              "type": "geo_point"
+            }
+          }
+        }
+      }
+    }
+    ```
+
+    You can create additional mapping configurations in the **Dynamic templates** and **Advanced options** tabs. For this tutorial, do not create any additional mappings.
+
+4. Define an alias named `my-index`:
+
+    ```js
+    {
+      "my-index": {}
+    }
+    ```
+
+5. On the review page, check the summary. If everything looks right, click **Create template**.
+
+**Step 3. Create new indices**
+
+You’re now ready to create new indices using your index template.
+
+1. Index the following documents to create two indices: `my-index-000001` and `my-index-000002`.
+
+    ```console
+    POST /my-index-000001/_doc
+    {
+      "@timestamp": "2019-05-18T15:57:27.541Z",
+      "ip": "225.44.217.191",
+      "extension": "jpg",
+      "response": "200",
+      "geo": {
+        "coordinates": {
+          "lat": 38.53146222,
+          "lon": -121.7864906
+        }
+      },
+      "url": "https://media-for-the-masses.theacademyofperformingartsandscience.org/uploads/charles-fullerton.jpg"
+    }
+
+    POST /my-index-000002/_doc
+    {
+      "@timestamp": "2019-05-20T03:44:20.844Z",
+      "ip": "198.247.165.49",
+      "extension": "php",
+      "response": "200",
+      "geo": {
+        "coordinates": {
+          "lat": 37.13189556,
+          "lon": -76.4929875
+        }
+      },
+      "memory": 241720,
+      "url": "https://theacademyofperformingartsandscience.org/people/type:astronauts/name:laurel-b-clark/profile"
+    }
+    ```
+
+2. Use the [get index API](https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-get) to view the configurations for the new indices. The indices were configured using the index template you created earlier.
+
+    ```console
+    GET /my-index-000001,my-index-000002
+    ```

manage-data/data-store/templates/index-template-management.md

@@ -57,7 +57,7 @@ toc:
         children:
           - file: data-store/templates/simulate-multi-component-templates.md
           - file: data-store/templates/config-ignoremissingcomponenttemplates.md
-          - file: data-store/templates/index-management-in-ui.md
+          - file: data-store/templates/index-template-management.md
       - file: data-store/aliases.md
       - file: data-store/manage-data-from-the-command-line.md
   - file: ingest.md