Merge branch '8.x' into backport-3597-to-8.x

Author: lcawl

docs/modeling-guide.md

@@ -577,6 +577,7 @@ class Foo {
 
 The server side default value if the property is not specified.
 Default values can only be specified on optional properties.
+They appear in the generated documentation and do not affect clients.
 
 ```ts
 class Foo {

docs/overlays/elasticsearch-shared-overlays.yaml

@@ -170,6 +170,11 @@ actions:
       # S
         - name: script
           x-displayName: Script
+          description: >
+            Use the script support APIs to get a list of supported script contexts and languages.
+            Use the stored script APIs to manage stored scripts and search templates.
+          externalDocs:
+            url: https://www.elastic.co/guide/en/elasticsearch/reference/master/modules-scripting.html
         - name: search
           x-displayName: Search
         - name: search_application