Elasticsearch 在文档字段的数组条件中查询

Question

I have a document like this:

{
  "_index": "listings",
  "_type": "listing",
  "_id": "234",
  "_source": {
    "category_id": "43608",
    "categories": [
      43608,
      43596
    ]
  }
}

I wanna query to array search category_id in categories . some thing like that

{
  "query": {
    "bool": {
      "must": [
        {
          "terms": {
            "category_id": "doc.categories"
          }
        }
      ]
    }
  }
}

What I supposed to do?

Answer 1

As, category_id is a string type, better to use SHOULD query instead of MUST and Simply, Itrate through the array categories and make separate term level query for each element in array.

{
  "query": {
    "bool": {
      "should": [
        {
          "term": {
            "category_id": "doc.categories[0]"
          }
        },
       {
          "term": {
            "category_id": "doc.categories[1]"
          }
        },
        ...
      ]
    }
  }
}

It will return you all which match any of categories array.

Answer 2

You have to user script for find a field value in another field value.

{
  "script": {
    "script": {
      "source": "doc.containsKey('categories') && doc['categories'].values.contains(doc['category_id'].value)",
      "lang": "painless"
    }
  }
}