:::tips 官方手册：https://www.elastic.co/guide/en/elasticsearch/reference/7.9/rest-apis.html :::
查看健康状态
GET http://localhost:9200/_cat/health
查看所有索引
GET http://localhost:9200/_cat/indices
查看某个索引下的所有文档
GET http://localhost:9200/<index>/_search
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