I have an issue where I upgraded my ElasticSearch cluster (3 masters, 5 data) from 0.90.10 to 1.4.5. All the existing indices are missing when I look in kopf. They are present on disk, but not in kopf.
Can I get them back directly, or do I have to regenerate all the data?
I attended the upgrade webinar and it seems the Lucene in 1.4.5 should be able to read the indices from 0.90.10, so that's not the problem.
Perhaps a bug or a split-brain issue?
Any help is greatly appreciated.