I am trying to debug logstash; therefore, I need it's debug logs but couldn't find any. In fact, I moved the ELK stack from one Windows box to another. Obviously, version has also changed. Before I was using logstash-indexer.cfg but now I have noticed that there is by default another file called logstash.json. I did copy all the contents from old to new one and start the logstash service with logstash.json configuration file but it seems, it's not shipping logs to Elasticsearch.