Added/updated snippets for docs (#2318)

docs/doc_examples/2ee002e60bd7a38d466e5f0eb0c38946.asciidoc

@@ -0,0 +1,18 @@
+// This file is autogenerated, DO NOT EDIT
+// Use `node scripts/generate-docs-examples.js` to generate the docs examples
+
+[source, js]
+----
+const response = await client.indices.updateAliases({
+  actions: [
+    {
+      add: {
+        index: "my-index-2099.05.06-000001",
+        alias: "my-alias",
+        routing: "1",
+      },
+    },
+  ],
+});
+console.log(response);
+----