Repro for double id problem

doubleid.sh

#!/bin/sh
curl -XDELETE "http://localhost:9200/test"
curl -XPUT "http://localhost:9200/test" -d '{
    "mappings" : {
        "rec" : {
            "_id" : {"store" : "yes"}
        }
    }
}'
curl -XPUT "http://localhost:9200/test/rec/1" -d '{
    "_id": "1"
}'
curl -XPUT "http://localhost:9200/test/rec/2" -d '{
}'
curl -XPOST "http://localhost:9200/test/_refresh"
echo
curl "localhost:9200/test/_search?fields=_id,message&pretty=true"