Hi Spencer,
Below is screenshot :
We have similar question asked earlier but no resolution : Terminate long running queries to protect the system from DoS
The issue occurs if a user fires a long running query from Kibana which times out after 300000ms as shown in screenshot. This makes Kibana inaccessible to other users as well. While the status is red I am able to query ES health using curl. Hope this clarifies.
Thanks
Bal