Added/updated snippets for docs (#2318)

docs/doc_examples/df1336e768fb6fc1826a5afa30a57285.asciidoc

@@ -0,0 +1,17 @@
+// 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: "my-data-stream",
+  document: {
+    "@timestamp": "2099-03-08T11:06:07.000Z",
+    user: {
+      id: "8a4f500d",
+    },
+    message: "Login successful",
+  },
+});
+console.log(response);
+----