Decoder

Elastic enables you to use your own decoder for deserializing JSON data as received from Elasticsearch. Use client.SetDecoder(...) to implement your own.

Here is an example:

// CountingDecoder needs to implement the elastic.Decoder interface.
type CountingDecoder struct {
  dec json.Decoder
  N int64
}

func (d *CountingDecoder) Decode(data []byte, v interface{}) error {
  atomic.AddInt64(&d.N, 1)
  return json.NewDecoder(bytes.NewReader(data)).Decode(v)
} 

...
client.SetDecoder(&CountingDecoder{})