[source, ruby]
----
response = client.search(
  body: {
    size: 0,
    aggregations: {
      my_date_histo: {
        date_histogram: {
          field: 'date',
          calendar_interval: '1M'
        },
        aggregations: {
          the_sum: {
            sum: {
              field: 'price'
            }
          },
          the_movavg: {
            moving_fn: {
              buckets_path: 'the_sum',
              window: 10,
              script: 'if (values.length > 5*2) {MovingFunctions.holtWinters(values, 0.3, 0.1, 0.1, 5, false)}'
            }
          }
        }
      }
    }
  }
)
puts response
----
