Machine learning data frame analytics

GET /_ml/data_frame/analytics/{id} PUT /_ml/data_frame/analytics/{id} DELETE /_ml/data_frame/analytics/{id} POST /_ml/data_frame/_evaluate POST /_ml/data_frame/analytics/{id}/_explain GET /_ml/data_frame/analytics/{id}/_stats POST /_ml/data_frame/analytics/{id}/_preview POST /_ml/data_frame/analytics/{id}/_start POST /_ml/data_frame/analytics/{id}/_stop POST /_ml/data_frame/analytics/{id}/_update