inanzzz | Excluding nested source object data in elasticsearch query result

You can use Source Filtering feature to exclude _source (object/nested data) in elasticsearch query results. This examples excludes child _source object completely.

Mapping

As you can see below, 1 parent product document can have many child tags documents in it.

{
  "product_idx": {
    "mappings": {
      "product": {
        "properties": {
          "id": {
            "type": "integer"
          },
          "name": {
            "type": "text"
          },
          "tags": {
            "properties": {
              "id": {
                "type": "integer"
              },
              "name": {
                "type": "text"
              }
            }
          }
        }
      }
    }
  }
}

Including tags

curl -XPOST 'http://localhost:9200/product_idx/_search' -d '{
 "query": {
  "term": {
   "id": 1
  }
 }
}'

# Result
{
  "hits": {
    "hits": [
      {
        "_index": "product_idx",
        "_type": "product",
        "_id": "1",
        "_score": 1,
        "_source": {
          "id": 1,
          "name": "Phone",
          "tags": [
            {
              "id": 1,
              "name": "T1"
            },
            {
              "id": 2,
              "name": "T2"
            }
          ]
        }
      }
    ]
  }
}

Excluding tags

curl -XPOST 'http://localhost:9200/product_idx/_search' -d '{
 "query": {
  "term": {
   "id": 1
  }
 },
 "_source": {
  "excludes": [
   "tags"
  ]
 }
}'

# Result
{
  "hits": {
    "hits": [
      {
        "_index": "product_idx",
        "_type": "product",
        "_id": "1",
        "_score": 1,
        "_source": {
          "id": 1,
          "name": "Phone"
        }
      }
    ]
  }
}