Added/updated snippets for docs (#2318)

docs/doc_examples/902cfd5aeec2f65b3adf55f5e38b21f0.asciidoc

@@ -0,0 +1,13 @@
+// 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.index({
+  index: "kibana_sample_data_ecommerce2",
+  document: {
+    user: "kimchy",
+  },
+});
+console.log(response);
+----