A very late reponse, but I had the exact same issue. It occurred because /opt/bitnami/logstash/tmp/logstash.pid was not deleted after a crash of logstash. After deleting this file, logstash started again without errors.
Its pretty uncomfortable to tell you guy that i am also suffering from this issue i dont know what i do with this error there is no tutorial i find on on internet that give me the right solution plzz help me if you know something about this erro.
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