Added/updated snippets for docs (#2318)

docs/doc_examples/f2f1cae094855a45fd8f73478bec8e70.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.split({
+  index: "my_source_index",
+  target: "my_target_index",
+  settings: {
+    "index.number_of_shards": 5,
+  },
+  aliases: {
+    my_search_indices: {},
+  },
+});
+console.log(response);
+----