Elasticsearch failed to collect data blocked by SERVICE_UNAVAILABLE

Elastic Stack Elasticsearch
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I am running a set-up with just Elasticsearch, Kibana and Logstash. All components are active and automatically started with systemd.

Yesterday I did load data from a CSV into ELK and did create a chart in Kibana.
Today I wanted to check this diagram but it doesn't show anything.

I did check /var/log/elasticsearch for further information.
In the end of the log file I see many errors.

Can anyone help me what I should do?

Here is the log file: https://pastebin.com/TAdKnAih

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