Added/updated snippets for docs (#2318)

docs/doc_examples/36e09bbd5896498ede0f5d37a18eae2c.asciidoc

@@ -0,0 +1,20 @@
+// 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-index-000001",
+  id: 2,
+  routing: 1,
+  refresh: "true",
+  document: {
+    text: "This is a child document.",
+    "my-join-field": {
+      name: "my-child",
+      parent: "1",
+    },
+  },
+});
+console.log(response);
+----