Vespa Aggregation - Timeout with limit and unranked.

gistfile1.txt

curl 'http://localhost:8080/search/?yql=select%20*%20from%20sources%20*%20where%20(sddocname%20contains%20(%5B%7B%22implicitTransforms%22%3A%20false%7D%5D%22tweet%22))%20limit%200%20%7C%20all(group(n_tA_c)%20max(1)%20each(output(count()%20as(count))))%3B&ranking=unranked' | python -m json.tool
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   472  100   472    0     0     23      0  0:00:20  0:00:20 --:--:--   118
{
    "root": {
        "children": [
            {
                "children": [
                    {
                        "children": [
                            {
                                "fields": {
                                    "count": 0
                                },
                                "id": "group:string:2017",
                                "relevance": 0.0,
                                "value": "2017"
                            }
                        ],
                        "continuation": {
                            "next": "BGAAABEBCBC"
                        },
                        "id": "grouplist:n_tA_c",
                        "label": "n_tA_c",
                        "relevance": 1.0
                    }
                ],
                "continuation": {
                    "this": ""
                },
                "id": "group:root:0",
                "relevance": 1.0
            }
        ],
        "errors": [
            {
                "code": 12,
                "message": "Timeout while waiting for sc0.num0",
                "source": "content-root-cluster",
                "summary": "Timed out"
            }
        ],
        "fields": {
            "totalCount": 0
        },
        "id": "toplevel",
        "relevance": 1.0
    }
}