[7.x] [DOCS] Update index templates example (#62530) (#62572)

docs/management/managing-indices.asciidoc

@@ -126,6 +126,23 @@ under the *Mapped fields* tab as follows:
 [role="screenshot"]
 image::images/management-index-templates-mappings.png[Mapped fields page]
 
+Alternatively, you can click the *Load JSON* link and define the mapping as JSON:
+
+[source,js]
+----------------------------------
+{	
+  "properties": {
+    "geo": {
+      "properties": {	
+        "coordinates": {	
+          "type": "geo_point"	
+        }  	
+      }    	
+    }	
+  }	
+}	
+----------------------------------
+
 You can create additional mapping configurations in the *Dynamic templates* and
 *Advanced options* tabs. No additional mappings are required for this example.