Hello, and thank you for using Amazon Lightsail.
To do this, you'd want to use Lightsail's VPC Peering feature: https://lightsail.aws.amazon.com/ls/docs/en_us/articles/lightsail-how-to-set-up-vpc-peering-with-aws-resources
You would need the ElastiCache Redis cluster to be created in your account's default VPC. Then, after enabling VPC peering in the region within Lightsail, you should be able to connect to your Redis cluster, assuming your cluster's security group rules allow it.
I hope this helps!
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