实际上，问题是文档似乎被分割在第2行和第4行之间，而且这两行都不完整

{ "index" :{ "_index" : "type", "_type" : "type", "_id" : "1" }}
{"type": "Variable", "processDefinitionKey":"Variable1", "products":[
{ "index" :{ "_index" : "new_type", "_type" : "new_type", "_id" : "1" }}
{ "code": "20", "type": "Variable", "name": "Integer"}]}

你的文件是这样的

{"type": "Variable", "processDefinitionKey":"Variable1", "products":[

再加上这个

{ "code": "20", "type": "Variable", "name": "Integer"}]}

但它被分成两行 index 中间的命令。。。那不行。
它应该是这样的：

{ "index" :{ "_index" : "type", "_type" : "type", "_id" : "1" }}
{"type": "Variable", "processDefinitionKey":"Variable1", "products":[{ "code": "20", "type": "Variable", "name": "Integer"}]}
{ "index" :{ "_index" : "new_type", "_type" : "new_type", "_id" : "1" }}
{"type": "Variable", "processDefinitionKey":"Variable1", "products":[{ "code": "20", "type": "Variable", "name": "Integer"}]}

您需要确保：
json文档位于一行（不是多行）
每个json文档都有相应的命令行
最后一行以换行符结尾（由于so格式，上面不可见）