As the founder and product-owner, I am leveraging the Redisson client to establish a connection to the Redis servers. Unfortunately, Aiven has yet to incorporate the CA certificate. We ensure our connections are made via the Redisson client, which necessitates end-to-end encryption. To facilitate this, we require the CA certificate, either supplied by Aiven or a custom CA, during the use of the Redisson client as found on redisson.org and redisson.pro. According to the configuration guide on Github, this procedure guarantees that all traffic is consistently encrypted from one end to another. This feature is essential for us to deliver financial services. Without it, we won't be able to incorporate Aiven into our product.

Reference:
https://github.com/redisson/redisson/wiki/2.-Configuration#ssltruststore-2