Reindexing of .Kibana made all the dashboards disappear

https://www.elastic.co/guide/en/elasticsearch/reference/6.6/indices-aliases.html has the details, but you want to do something like;

POST /_aliases
{
    "actions" : [
        { "remove" : { "index" : ".kibana-$currentone", "alias" : ".kibana" } },
        { "add" : { "index" : ".kibana-$oldone", "alias" : ".kibana" } }
    ]
}

Just replace $currentone and $oldone in the example above to match the name of the underlying indices.

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