es5.2 rollover的问题

今天在5.2版本的集群测试rollover功能，索引template：

{

  "order": 0,

  "template": "access-logs-*",

  "settings": {

    "index": {

      "number_of_shards": "2",

      "number_of_replicas": "1",

      "routing": {

        "allocation": {

          "include": {

            "_ip": "x.x.x.x,x.x.x.x"

          },

          "total_shards_per_node": "2"

        }

      }

    }

  },

  "mappings": {},

  "aliases": {

    "access-logs": {},

    "search-logs": {}

  }

}

创建索引，写入三个文档，然后执行rollover：

POST access-logs/_rollover

{

  "conditions": {

    "max_age":   "7d",

    "max_docs":  6

  }

}

然后成功了？返回结果如下：

{

  "old_index": "access-logs-000001",

  "new_index": "access-logs-000002",

  "rolled_over": true,

  "dry_run": false,

  "acknowledged": true,

  "shards_acknowledged": true,

  "conditions": {

    "[max_docs: 6]": true,

    "[max_age: 7d]": false

  }

}

可是我明明只写入了三个文档，rollover的max_docs阈值是6就成功了，这个max_docs指的是主分片加副本的数量吗