Added/updated snippets for docs (#2318)

docs/doc_examples/ec195297eb804cba1cb19c9926773059.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.indices.putSettings({
+  index: "mylogs-pre-ilm*",
+  settings: {
+    index: {
+      lifecycle: {
+        name: "mylogs_policy_existing",
+      },
+    },
+  },
+});
+console.log(response);
+----