[source, ruby]
----
response = client.ml.evaluate_data_frame(
  body: {
    index: 'animal_classification',
    evaluation: {
      classification: {
        actual_field: 'animal_class',
        predicted_field: 'ml.animal_class_prediction',
        metrics: {
          multiclass_confusion_matrix: {}
        }
      }
    }
  }
)
puts response
----
