Represents the input of a "test-failover" operation which testautomatic failover on a specified node group (called shard in theconsole) in a replication group (called cluster in the console).Show details from next link. https://docs.aws.amazon.com/ja_jp/cli/latest/reference/elasticache/test-failover.html
| aws elasticache test-failover \ |
| Minimizing Downtime: Multi-AZ with Automatic Failover - Amazon ElastiCache for Redis : http://docs.aws.amazon.com/AmazonElastiCache/latest/red-ug/AutoFailover.html |