ElasticSearch simple query

I have structure like this in my ElasticSearch

{
        _index: 'index',
        _type: 'product',
        _id: '896',
        _score: 0,
        _source: {
          entity_id: '896',
          category: [
            {
              category_id: 2,
              is_virtual: 'false'
            },
            {
              category_id: 82,
              is_virtual: 'false'
            }
          ]
        }
      }

I want return all "producs" that have "82" category_id.

{
  "query": {
    "bool": {
      "filter": {
        "terms": {
          "category.category_id": [
            82
          ]
        }
      }
    }
  }
}

This query gives me 0 hits.

What is right way to do this?

Adding working example, you need to define the category as nested field and modify your search query by including the nested path

Index Mapping

{
    "mappings": {
        "properties": {
            "entity_id": {
                "type": "text"
            },
            "category": {
                "type": "nested"
            }
        }
    }
}

Index your document

{
    "entity_id": "896",
    "category": [
        {
            "category_id": 2,
            "is_virtual": false
        },
        {
            "category_id": 82,
            "is_virtual": false
        }
    ]
}

Proper search query, note we are using nested query which doesn't support normal filter(so your query gives error)

{
    "query": {
        "nested": {
            "path": "category",
            "query": {
                "bool": {
                    "must": [
                        {
                            "match": {
                                "category.category_id": 82
                            }
                        }
                    ]
                }
            }
        }
    }
}

Search result retuns indexed doc

 "hits": [
            {
                "_index": "complexnested",
                "_type": "_doc",
                "_id": "1",
                "_score": 1.0,
                "_source": {
                    "entity_id": "896",
                    "category": [
                        {
                            "category_id": 2,
                            "is_virtual": false
                        },
                        {
                            "category_id": 82,
                            "is_virtual": false
                        }
                    ]
                }
            }
        ]