query_total is wrong for groups stats at shards level

gistfile1.txt

curl -XDELETE 'http://localhost:9200/_all?pretty'

curl -XPUT 'http://localhost:9200/test/?pretty' -d '
{
  "index": {
    "number_of_shards": 2,
    "number_of_replicas": 0
  }
}
'

curl -XGET 'http://localhost:9200/test/_search?pretty' -d '
{
  "stats" : ["group1"]
}
'

curl -XGET 'http://localhost:9200/test/_stats/search?groups=_all&level=shards&pretty'

# indices.test.shards.0.search.groups.group1.query_total:5 <==== wrong
# indices.test.shards.1.search.groups.group1.query_total:1 <==== good