503 Timeout exception error accessing Elasticsearch

Elastic Stack Elasticsearch
1

Kibana shows error below when I try access it.

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Suspecting that the app may be out of memory, I have tried using postman to send a "Delete" request but now get a "503 - Service Unavailable" exception with message: "process_cluster_event_timeout_exception"

Please advise on what to do.

2

The Elasticsearch server logs should contain more information, so the first thing to do is to look at them. You can share them here if you would like help with their interpretation.