How to disable redis replication in cluster

I have my Redis cluster set up successfully.

However, it seems like one or more of my slaves are always syncing from their respective master. I am always getting "LOADING Redis is loading the dataset in memory" although all the masters have finished initializing from Disk.

The cluster becomes un-usable because it's always throwing me "LOADING Redis is loading the dataset in memory".

My use case is that I will never do any writes to my Redis cluster after server restart, so there's no need to replicate to the slaves.

Any information would be greatly appreciated.

Thanks.