Mapper-attachments-helloworld not working

really new in elastic world, and install 2.4 + mapper-attachments plugin.

try index documnts with sample:
https://www.elastic.co/guide/en/elasticsearch/plugins/master/mapper-attachments-helloworld.html

but search found nothing
POST /trying-out-mapper-attachments/person/_search
{
"query": {
"query_string": {
"query": "ipsum"
}}}

if I add regualr field like :

POST /trying-out-mapper-attachments/person/3?refresh
{
"cv": "e1xydGYxXGFuc2kNCkxvcmVtIGlwc3VtIGRvbG9yIHNpdCBhbWV0DQpccGFyIH0=",
"firstName" : "dror"
}
then "dror" found, but on attachment field its not working.

can not found any logs, and even dont knoew if problem is with Index nor Query

Please format your code using </> icon. It will make your post more readable.

What is your mapping?

GET http://localhost:9200/stackoverflow/_mapping/post

{
   "stackoverflow": {
      "mappings": {
         "post": {
            "properties": {
               "answerCount": {
                  "type": "integer"
               },
               "body": {
                  "type": "string"
               },
               "creationDate": {
                  "type": "date",
                  "format": "strict_date_optional_time||epoch_millis"
               },
               "id": {
                  "type": "string"
               },
               "score": {
                  "type": "integer"
               },
               "suggest": {
                  "type": "completion",
                  "analyzer": "simple",
                  "payloads": false,
                  "preserve_separators": true,
                  "preserve_position_increments": true,
                  "max_input_length": 50
               },
               "tags": {
                  "type": "string",
                  "index": "not_analyzed"
               },
               "title": {
                  "type": "string"
               }
            }
         }
      }
   }
}

The first post you sent refers to trying-out-mapper-attachments index and person type.
Here you are showing an index named stackoverflow and a post type.

It's wrong.

Make sure you read https://www.elastic.co/guide/en/elasticsearch/plugins/current/mapper-attachments-helloworld.html

really embarrassing.
its works fine.
thanks.