Added/updated snippets for docs (#2318)

docs/doc_examples/d7a55a7c491e97079e429483085f1d58.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.putIndexTemplate({
+  name: "dsl-data-stream-template",
+  index_patterns: ["dsl-data-stream*"],
+  data_stream: {},
+  priority: 500,
+  template: {
+    settings: {
+      "index.lifecycle.name": "pre-dsl-ilm-policy",
+    },
+  },
+});
+console.log(response);
+----