无法在弹性搜索中获得基数计数

如何解决无法在弹性搜索中获得基数计数

我无法从 elasticsearch 索引中获取字段的基数。 映射如下：

我试图触发的查询如下：

--header 'Content-Type: application/json' \
--data-raw '{
        "aggs": {
            "type_count": {
                "cardinality": {
                    "field": "rawLog.keyword"
                }
            }
        }
}'```

but I am getting 0 in result

```{
    "took": 21,"timed_out": false,"_shards": {
        "total": 3,"successful": 3,"skipped": 0,"Failed": 0
    },"hits": {
        "total": {
            "value": 10000,"relation": "gte"
        },"max_score": null,"hits": []
    },"aggregations": {
        "type_count": {
            "value": 0
        }
    }
}```