How do I assign a new parameter group to my existing Amazon ElastiCache cluster without restarting the cluster?

A parameter group acts as a container for engine configuration values that can be applied to one or more cache clusters. ElastiCache uses this parameter group to control the runtime properties of your nodes and clusters. You can modify the values in a parameter group for an existing cluster without restarting the cluster.

1. Create a new parameter group. For detailed steps, see Creating a Parameter Group.
2. Modify the new parameter group and the parameters. For more information, see Modifying a Parameter Group.
3. Modify the cluster to use the new parameter group. For detailed steps, see Modifying an ElastiCache Cluster.