I'd be surprised if Logstash stopped suddenly without leaving any clues in its log file. If it really doesn't log anything I'd apply standard debugging procedures like trying to isolate the problem by excluding one or more of the configuration files and seeing if that makes a difference.
Apache, Apache Lucene, Apache Hadoop, Hadoop, HDFS and the yellow elephant
logo are trademarks of the
Apache Software Foundation
in the United States and/or other countries.