Added/updated snippets for docs (#2318)

docs/doc_examples/8c2060b0272556457f4871c5d7a589fd.asciidoc

@@ -0,0 +1,16 @@
+// 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.security.putRole({
+  name: "logstash-reader",
+  indices: [
+    {
+      names: ["logstash-*"],
+      privileges: ["read", "view_index_metadata"],
+    },
+  ],
+});
+console.log(response);
+----