结合实际使用场景详解reindex配合painless脚本的使用

1.同集群reindex

POST _reindex
{
  "source": {
    "index": "twitter"
  },
  "dest": {
    "index": "new_twitter"
  }
}

2.跨集群reindex

POST _reindex
{
  "source": {
    "remote": {
      "host": "http://oldhost:9200",
      "username": "user",
      "password": "pass"
    },
    "index": "source",
    "query": {
      "match": {
        "test": "data"
      }
    }
  },
  "dest": {
    "index": "dest"
  }
}

3.reindex操作注意事项

-跨集群reindex需要在写入数据的集群上添加远程集群的白名单，例如，需要将A集群(http://172.168.1.1:9200)数据reindex到B集群(http://172.168.1.2:9200),则A为远程集群，需要在B集群上操作，且B集群上各节点需要新增下面的配置

reindex.remote.whitelist: 172.168.1.1:9200

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