Elastic enterprise search - BadGatewayError [502] 'The instance rejected the connection.'

Elastic Stack Elasticsearch
1

Hi everyone,

We've been using Elasticsearch through App Search.
We've been getting the following error from time to time (~3% of our requests):

elastic_enterprise_search.exceptions.BadGatewayError: [502] {'ok': False, 'message': 'The instance rejected the connection.'}

Any hint of what may cause this (rate limiting, cluster memory, ...)?
Any way to investigate this further on the Elastic portal?

Thank you!

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