Retieve element in an array object

[pilo]

Hi everyone,
I have a question about array object in elasticsearch
For example i have a mapping like this one:

PUT test
{
  "settings": { ...},
  "mappings": {
    "properties": {
      "id":{
        "type": "keyword"
      },
      "levels":{
        "properties": {
          "translations":{
            "type": "text",
            "analyzer": "english"
          },
          "id":{
            "type": "keyword"
          }
        }
      }
    }
  }
}

And then, i add documents in index test:

{
  "id": 1,
  "levels":[
    {"id": 1, "translations": "lalaland"},
    {"id": 2, "translations": "lili"},
    {"id": 3, "translations": "lalaland"}
  ]
}

Then, i launch some search

GET test/_search
{
  "_source": "levels.translations", 
  "query": {
    "match": {
      "levels.translations": "lalaland"
    }
  },
  "highlight": {
    "fields": {"levels.translations": {}}
  }
}

The result is:

"hits" : [
      {
        "_index" : "test",
        "_type" : "_doc",
        "_id" : "1",
        "_score" : 0.3955629,
        "_source" : {
          "levels" : [
            {
             "id": 1,
              "translations" : "lalaland"
            },
            {
              "id": 2,
              "translations" : "lili"
            },
            {
              "id": 3,
              "translations" : "lalaland"
            }
          ]
        },
        "highlight" : {
          "levels.translations" : [
            "<em>lalaland</em>",
            "<em>lalaland</em>"
          ]
        }
      }
    ]

Are there anyway to retrieve just the first and the thirst element in levels field. I wonder if i can do it with nested ?
Thank you all.

[dadoonet (David Pilato)]

Hi

May be with this: https://www.elastic.co/guide/en/elasticsearch/reference/7.5/search-request-body.html#request-body-search-inner-hits

[pilo]

Thank you for you help.
That is exactly what i'm looking for.
Just to be sure, to use inner hits, my datatype field has to be nested and not object ?

[dadoonet (David Pilato)]

Yes. It won't work with object.

[pilo]

Thank a lot.