Added/updated snippets for docs (#2318)

docs/doc_examples/85479e02af00681210e17e3d0ff51e21.asciidoc

@@ -0,0 +1,18 @@
+// 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.indices.create({
+  index: "my-index-000001",
+  mappings: {
+    properties: {
+      date: {
+        type: "date",
+        format: "yyyy-MM-dd HH:mm:ss||yyyy-MM-dd||epoch_millis",
+      },
+    },
+  },
+});
+console.log(response);
+----