After a severe hardware error in my multisite cluster, how do I make replicated copies of raw data searchable?

[renems]

My multisite cluster suffered a severe hardware error. In some cases, I don't have a searchable copy left.
Unfortunately rebuild is not working: "rawdata is truncated".

However, I do have 3 replicated copies left, but they are not searchable.

How can I convert those to a searchable copy?

[renems · Accepted solution]

I've found the reason myself, I'd think sharing might help somebody else with the same problem:
Because I had a multisite cluster that did not have a suitable search factor for each site, there wouldn't be sufficient candidates. The easy resolution was to have the SF (and RF) at at least the same amount as the number of sites.