分页的Couchdb 2.0/db/_find总行数

Question

我用json数据发布请求(使用python请求lib):

    json_data = {
     "selector": {
        "year": {"$gt": 2010}
     },
     "fields": ["_id", "_rev", "year", "title"],
     "sort": [{"year": "asc"}],
     "limit": 10,
     "skip": 10
    }

    r = requests.post('http://127.0.0.1:5984/docs/_find',
                           json=json_data)

响应没有total_rows.我需要总行分页.我怎么得到这个？