Added/updated snippets for docs (#2318)

docs/doc_examples/ef33b3b373f7040b874146599db5d557.asciidoc

@@ -0,0 +1,12 @@
+// 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.analyze({
+  tokenizer: "keyword",
+  filter: ["lowercase"],
+  text: "this is a test",
+});
+console.log(response);
+----