How to put logstash in debug logging mode?

We are chasing a problem where logstash stops listening, and starts logging this over and over:

Encountered a retryable error. Will Retry with exponential backoff 
{:code=>400, :url=>"http://<IP of ES endpoint>:9200/_bulk"}

How do we get more debug/detail out of logstash to chase this?

You should check the Elasticsearch logs.

Also will be of some use :slight_smile:

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