elasticSearch7.9数据占用磁盘存储空间情况

最近，在VMware Workstation虚拟机上安装了es7.9，单节点的es，不是集群，然后建了一个索引（包含3个分片和一个副本），插入了500万条数据，占据磁盘空间17G。如下图：

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索引的字段如下，仅供参考：

PUT my_log
{
  "settings":{
    "index":{
      "number_of_shards":"3",
      "number_of_replicas":"1"
    }
  },
  "mappings": {
    "properties": {
      "logId ": {
        "type": "keyword"
      },
      "xxxId": {
        "type": "keyword"
      },
      "xxxDataId": {
        "type": "keyword"
      },
      "xxxeName": {
        "type": "keyword"
      },
      "souxxxpic": {
        "type":"keyword"
      },
     "souxxxoup": {
        "type":"keyword"
      },
     "tarxxxame": {
        "type":"keyword"
      },
     "callxxxeMode": {
        "type":"keyword"
      },
     "callTxxxdeName": {
        "type":"keyword"
      },
     "mxxxce": {
        "type":"keyword"
      },
     "datxxxory": {
        "type": "keyword"
      },
     "daxxxame": {
        "type":"keyword"
      },
     "filexxxId": {
        "type":"keyword"
      },
     "filexxxName": {
        "type":"keyword"
      },
     "fixxxype": {
        "type":"keyword"
      },
     "filxxxName": {
        "type":"text"
      },
     "logxxxName": {
        "type":"text"
      },
     "loxxxpe": {
        "type":"keyword"
      },
     "buxxxtage": {
        "type":"keyword"
      },
     "buxxxeName": {
        "type":"text"
      },
     "buixxxgeTime": {
        "type": "date",
        "format": "yyyy-MM-dd HH:mm:ss.SSS"
      },
     "buinxxxeStatus": {
        "type": "keyword"
      },
     "buixxxatusName": {
        "type":"keyword"
      },
     "rexxxMode": {
        "type": "keyword"
      },
     "recxxxdeName": {
        "type":"keyword"
      },
     "creaxxxTime": {
        "type": "date",
        "format": "yyyy-MM-dd HH:mm:ss.SSS"
      },
     "rexxxime": {
        "type": "date",
        "format": "yyyy-MM-dd HH:mm:ss.SSS"
      },
     "msgSxxxTime": {
        "type": "date",
        "format": "yyyy-MM-dd HH:mm:ss.SSS"
      },
     "callTarxxxime": {
        "type": "date",
        "format": "yyyy-MM-dd HH:mm:ss.SSS"
      },
     "begxxxxime": {
        "type": "date",
        "format": "yyyy-MM-dd HH:mm:ss.SSS"
      },
     "endRexxxgTime": {
        "type": "date",
        "format": "yyyy-MM-dd HH:mm:ss.SSS"
      },
     "resolxxxdTime": {
        "type": "date",
        "format": "yyyy-MM-dd HH:mm:ss.SSS"
      },
     "getFxxxTime": {
        "type": "date",
        "format": "yyyy-MM-dd HH:mm:ss.SSS"
      },
     "getFixxxTime": {
        "type": "date",
        "format": "yyyy-MM-dd HH:mm:ss.SSS"
      },
     "resoxxxnTime": {
        "type": "date",
        "format": "yyyy-MM-dd HH:mm:ss.SSS"
      },
     "resxxxndTime": {
        "type": "date",
        "format": "yyyy-MM-dd HH:mm:ss.SSS"
      },
     "saveFixxxdTime": {
        "type": "date",
        "format": "yyyy-MM-dd HH:mm:ss.SSS"
      },
     "successNumber": {
        "type": "long"
      },
     "errorNumber": {
        "type": "long"
      },
     "buinessNumber": {
        "type": "long"
      },
     "descInfo": {
        "type": "text"
      }
    }
  }
}