ES8.13 _bulk报错Malformed content, found extra data after parsing: START_OBJECT解决

在使用elaticsearch8.13.0使用批量创建索引时，根据谷粒中说的es7.9方法去批量操作请求：

http://127.0.0.1:9200/shop/_doc/_bulk

注意1：设置header为Content-Type:application/x-ndjson,否则请求报错：

{
    "error": "Content-Type header [] is not supported",
    "status": 406
}

body:

{"index": {"_index":"shop","_type":"_doc","_id": "2004"}} 
{"id": "2004", "nickname": "index2004"} 
{"index": {"_index":"shop","_type":"_doc","_id": "2007"}} 
{"id": "2007", "nickname": "name2007"} 
{"index": {"_index":"shop",&