笔记：remote reindex无法从ES7--＞ES6

背景

测试经常使用reindex API，一般都是同版本或者升级版本使用；

使用

remote reindex

POST _reindex
{"conflicts": "proceed","source": {"remote": {"host": "http://xxx.com:80","username": "elastic","password": "xxxxx","headers": {"x-client-app": "12345"}},"index": "test","size": 1000,"query": {"match_all": {}}},"dest": {"index": "test"}
}

发现报错

{"error": {"root_cause": [{"type": "exception","reason": "Error parsing the response, remote is likely not an Elasticsearch instance"}],"type": "exception","reason": "Error parsing the response, remote is likely not an Elasticsearch instance","caused_by": {"type": "x_content_parse_exception","reason": "[1:242] [search_response] failed to parse field [hits]","caused_by": {"type": "x_content_parse_exception","reason": "[1:242] [hits] total doesn't support values of type: START_OBJECT"}}},"status": 500
}

原因：remote reindex无法从ES7同步数据到ES6（不能降级）