I do have an "Under-protected" index level for one of my indexes. I have performed a configuration change for this index and increased the number of copies to 2 and added as well a re-balancing step to the management queue. Then started the task in this queue. After a while I get the message back that, it has failed. I have retried. But with same result.
The reason why I do this is that, when searching I get SolrPlugin error saying that it can't find an healthy node to handle the request.
What is the next step I can go to fix this?
Any good hint is very much welcome.