You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: client_v6.go
    path of file: ./repos/cadence/host/esutils
    
    the code of the file until where you have to start completion: // Copyright (c) 2020 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any perso
    
func newV6Client(url string) (*v6Client, error) {
	esClient, err := elastic.NewClient(
		elastic.SetURL(url),
		elastic.SetRetrier(elastic.NewBackoffRetrier(elastic.NewExponentialBackoff(128*time.Millisecond, 513*time.Millisecond))),
	)
	return &v6Client{
		client: esClient,
	}, err
}