We've recently upgraded our hardware, and have now got a replacement ES cluster.
I want to restore the indices on our old cluster into/onto the new cluster without losing what is currently on the new cluster. I.e. I want to merge the data.
Which is the best way to achieve this? I've read the snapshot/restore docs and it appears that the restore doesn't have a non-destructive/merge feature, only a "drop and recreate" (to borrow an antiquated phrase) method.
This is all on Windows, which I'm sure I'll be told makes things even more difficult.
Thanks for any help,