terms聚合size不能为0吗

我看别人的size可以为0，但是我的报错了
{
  "query": {

  },
  "aggs": {
    "test": {
      "terms": {
        "field": "account_id",
        "size": 0
      }
    }
  }
}
 
{
  "error": {
    "root_cause": [
      {
        "type": "parsing_exception",
        "reason": "[terms] failed to parse field [size]",
        "line": 9,
        "col": 17
      }
    ],
    "type": "parsing_exception",
    "reason": "[terms] failed to parse field [size]",
    "line": 9,
    "col": 17,
    "caused_by": {
      "type": "illegal_argument_exception",
      "reason": "[size] must be greater than 0. Found [0] in [test]"
    }
  },
  "status": 400
}