[source, ruby]
----
response = client.search(
  index: 'sales',
  size: 0,
  body: {
    query: {
      constant_score: {
        filter: {
          match: {
            type: 'hat'
          }
        }
      }
    },
    aggregations: {
      hat_prices: {
        sum: {
          field: 'price',
          missing: 100
        }
      }
    }
  }
)
puts response
----
