How do i sort before order with cardinalit aggs

Elastic Stack Elasticsearch
1

Hi experts
I have my query

{
	"query": {"term": { "content_level": "A" }}, 
	"aggs": {
		"author": {
			"terms": {"field": "author_name",
					"order": { "count.value" : "desc" },
					"size" : 10},
			"aggs": {
				"count": {
					"cardinality": {"field": "news_id"}
				}
			}
		}
	}
}

The buckets result seem ok but my problem is if the Author dont have content_level A, i cant show this author. So i want to update my query with sort by content_level desc then do the cardinality aggresstion. How can i do it. I have try many ways but my buckets still get wrong result.
Thanks

2

Anyone can help me solve this
Thanks