// 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.ingest.simulate({
  pipeline: {
    processors: [
      {
        script: {
          description: "Set index based on `lang` field and `dataset` param",
          lang: "painless",
          source:
            "\n            ctx['_index'] = ctx['lang'] + '-' + params['dataset'];\n          ",
          params: {
            dataset: "catalog",
          },
        },
      },
    ],
  },
  docs: [
    {
      _index: "generic-index",
      _source: {
        lang: "fr",
      },
    },
  ],
});
console.log(response);
----