How do I update data across indexes

Elastic Stack Elasticsearch
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问题描述：索引B中新增加了两个字段，现需要从索引A中获取这两个字段的值并赋值给B
详细情况：
1.索引A中部分字段：pro_id, tran_id, app_id, type .......
2.索引B中部分字段：app_id, type .......
3. 现 索引B中新增 pro_id和tran_id字段，要求将存量数据与索引A中数据同步
4. 即：当 满足 A.app_id=B.app_id 和 A.type=B.type 时，将A.pro_id、A.tran_id 赋值到索引B

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