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Well, I figured out myself :)

The reason is that my previous installation had ElasticSearch limitation in 1000 shards. And logs said that there were errors about that:

Details

@timestamp":"2026-05-28T15:02:01.471+00:00","message":"Reason: Unable to complete saved object migrations for the [.kibana_search_solution] index: [cluster_shard_limit_exceeded] Upgrading Kibana requires adding a small number of new shards. Ensure that Kibana is able to add 10 more shards by increasing the cluster.max_shards_per_node setting, or removing indices to clear up resources. See https://www.elastic.co/docs/troubleshoot/kibana/migration-failures#cluster-shard-limit-exceeded\nError: Unable to complete saved…

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