Could be something network related. From the logs, it looks like 16 dropped out and then 17 and 15 decided that 17 is the new master. If you have not added more data since, you can restart 16 and see if it joins back to the cluster. Regardless, you probably want to set discovery.zen.minimum_master_nodes: 2 for all your 3 nodes to ensure that if a node drops out, it will not form a cluster by itself and continue to accept requests.
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