gistfile1.txt

curl -XPUT localhost:9200/test/type/1 -d '{
    "a" : {
        "x" : "aaa"
    },
    "b" : {
        "x" : "bbb"
    }
}'

curl -XPUT localhost:9200/test/type/2 -d '{
    "a" : {
        "x" : "zzz"
    },
    "b" : {
        "x" : "yyy"
    }
}'

curl -XPOST localhost:9200/_refresh


curl 'localhost:9200/test/_search?q=*&sort=a.x'