Install logstash on Docker return LOGSTASH_VERSION: not found


I'm new to Docker and Logstash, currently I'm trying to install logstash 5.1.1 on Docker.

When I run the logstash it returned:

"/opt/logstash/vendor/jruby/bin/jruby: line 14: LOGSTASH_VERSION: not found"

here is my command:
CMD bin/logstash -f /opt/logstash/data/import.conf --path.settings=/opt/logstash/conf

Appreciate immediate help!

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