PUT json/try/1
    {
        "name":"rajesh",
        "emp id":236947,
"dob":"28-02-1989"
}

PUT /json/try/_mapping
        {
            "dob": {
            "type" : "date",
            "format" : "dd-mm-yyyy"}
        }

PUT json/try/_mapping
{
    "try":{
        "properties": {
            "dob":{
                "type": "date"
                , "format": "date"
             }
         }
     }
 }`