Added/updated snippets for docs (#2318)

docs/doc_examples/9a05cc10eea1251e23b82a4549913536.asciidoc

@@ -0,0 +1,12 @@
+// 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.cat.allocation({
+  v: "true",
+  s: "node",
+  h: "node,shards,disk.percent,disk.indices,disk.used",
+});
+console.log(response);
+----