Bonsai provides a real-time stream of all the requests hitting your cluster. There is also a subtab for the Top 20 Slow Requests. This will begin to populate if requests slow down measurably.
The streaming logs show a timestamp, HTTP verb and endpoint, along with how long it took Elasticsearch to respond and what HTTP response code was returned. Request/response payloads are not captured.
Bonsai does not expose server logs at this time.