Cannot view single document however index exists

I receive nginx logs from filebeat. Search works well.
But in kibana in the expanded view, click View single document I get error:
Cannot run search
filebeat-7.9.2-2022.06.23-001859 is missing. [Please ensure the index exists.]

Request HEAD /filebeat-7.9.2-2022.06.23-001859 returns 200 - OK. Also index is shown in Stack management - Index management.

It worked some time before.
I tried restart elasticsearch and kibana services. I tried reboot entire server. This doesn't help.

Elasticsearch and kibana version 7.9.2-1.

How it can be solved?

I found the error. There was forbidden rule for location /elasticsearch/ on reverse proxy.

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