Discover gives error from Kibana

Hi,
Click on discover icon from kibana gives the following error:

Error: Request to Elasticsearch failed: ("error": {"root_cause": [{"reason': 'forbidden' due to
["OPERATION NOT ALLOWED"]}], "reason": "forbidden", "due to": ["OPERATION NOT ALLOWED"] status" 401))

Could you help?

What do your Elasticsearch and Kibana logs show?

Cause that suggests you are not correctly authorised with Elasticsearch.

I have rights to delete indices.
Doesn't that mean that I am authorized with Elasticsearch. ?

How can I look at the logs?

The cause of the error was system/network related.