如何通过Java API使用脚本更新elsaticsearch文档中的一个字段？

RestHighLevelClient client = new RestHighLevelClient(
        RestClient.builder(new HttpHost("localhost", 9200, "http")));

UpdateRequest request = new UpdateRequest("index_name", "doc_type", "document_id");

Script inlineScript = new Script(ScriptType.INLINE, "painless",
        "ctx._source.field_name = 'new_value'", Collections.emptyMap());
request.script(inlineScript);

try {
    UpdateResponse response = client.update(request, RequestOptions.DEFAULT);
    if (response.getResult() == DocWriteResponse.Result.UPDATED) {
        System.out.println("文档更新成功");
    } else if (response.getResult() == DocWriteResponse.Result.NOOP) {
        System.out.println("文档未发生更新");
    }
} catch (IOException e) {
    e.printStackTrace();
}