Thanks gekoner. Yeah this is a weird one. I/O hopefully isn't the cause as its a dedicated filer for this purpose, and we don't have any users on the new cluster yet (or data coming in).
Interestingly, before I had configured mounted bundles, I had added these indexers as normal search peers, and all worked properly. So definitely this is something to do with Shared Bundles, the filer, directory paths/permissions, etc. I wish the docs were more explicit in this area.
I've opened a support ticket with splunk, I will post an answer here after we've worked it out.
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