Added/updated snippets for docs (#2318)

docs/doc_examples/40f97f70e8e743c6a6296c81b920aeb0.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.nodes.stats({
+  human: "true",
+  filter_path:
+    "nodes.*.name,nodes.*.indices.mappings.total_estimated_overhead*,nodes.*.jvm.mem.heap_max*",
+});
+console.log(response);
+----