elasticsearch match only date of date field

Question

Following is the mapping for date field in elasticsearch index

persons:{
    "dob":{
    "type": "date",
    "format": "yyyy-MM-dd"
  }
}

Now I want to search all the persons whose birthday is on 5th of any month.

Thanks in advance.

Answer 1

So, with above solutions help. I made the query this way

"script_fields": {
   "isDOBMatch": {
     "script": {
         "lang":"painless",
       "inline": "doc.dob.date.dayOfMonth==params.dob_match_vals",
       "params": {
         "dob_match_vals": [**pass the value which u want to match**]
       }
     }
   }
 }

The above query returns true/false value.