es配置

1.下载es与插件head到本地，添加pom依赖（https://blog.csdn.net/sinat_42338962/article/details/85227902）

    org.elasticsearch.client
    elasticsearch-rest-high-level-client
    7.8.0
    
        
            org.elasticsearch
            elasticsearch
        
    



    org.elasticsearch
    elasticsearch
    7.8.0




    org.apache.logging.log4j
    log4j-api
    2.8.2


    org.apache.logging.log4j
    log4j-core
    2.8.2

2.启动es与插件
3.删除es中所有数据：curl -X DELETE http://localhost:9200/_all