ES: How to I delete the whole database contents and start clean again, without losing indexes & dashboards?

Ok, my server is still hosed (see below)... massive amount of unfixed shards etc

https://discuss.elastic.co/t/elasticsearch-cluster-of-4-nodes-has-master-not-discovered-exception/124984/18

How do I delete the whole database contents and start clean again, without losing indexes & dashboards? Help appreciated as my boss will be sending me to Microsoft for a solution soon if not sorted!!

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