使用painless_script报错解析失败

UpdateRequest updateRequest = new UpdateRequest("anothers", "type", "foo1")

                .script(new Script(ScriptType.INLINE,

                        "ctx._source.aka.removeIf(item -> item.name =='female')",

                        Script.DEFAULT_SCRIPT_LANG,

                        Collections.emptyMap()));

在header插件中直接请求却没有问题 ,下面是请求语法

{

  "script": {

    "source": "ctx._source.aka.removeIf(item -> item.name =='female');",

    "lang": "painless",

    "params": {}

  }

}

java中报错为java.lang.IllegalArgumentException: script_lang not supported [ctx._source.aka.removeIf(item -> item.name =='female')] 求大神帮忙解决下