Mapping error logs

Some of our logs from logstash to elasticsearch ends up in dead letter queue and I believe logstash used to dump the exception it gets before it ends up in dlq. For example, it will say one of the field is of the wrong type. For some reason, I can no longer see such informational errors in the log. I looked in a file normally called <root of logstash/log/logstash-plain.log. Any idea on how to find these errors?

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