Hello HA
The Forbidden message comes from the Dashboard (Kibana/GUI). The common reasons are;
1. Not enough disk space where Kibana/Dashboard is allocated.
2. Index.kibana is in read-only state.
3. User doesn't have enough permissions.
Kindly confirm the following
1. The role/access that is currently mapped to the user account you are using to access the Dashboard
2. Please run the command GET _cal/allocation?v from the Dev tool section in the Elasticsearch menu. It will show you details of each node with disk usage and shards available as well.
3. Also run GET .kibana*/_settings from the Dev tool section to check state of the Index.kibana
I will be expecting your feedback.
Best Regards