How can i connect my data nodes to another cluster (need to change cluster uuid)

Elastic Stack Elasticsearch
1

same issue with Data node’s cluster uuid diffrent from master node's cluster uuid

but I want to connect my data nodes to new cluster without deleting their data directory. is there any way to this?

I must delete data directory to connect new cluster? i don't want to lose my data
thanks in advance.

2

No, it is not possible. I would recommend using the snapshot API to create a backup of your data, then wipe the nodes and have them joing the new cluster. Once this is done you can mount and restore the snapshot to the new cluster.