The log message follows
[2017-09-07T18:36:35,335][FATAL][logstash.runner ] An unexpected error occurred! {:error=>#<ArgumentError: Setting "xpack.security.enabled" hasn't been registered>, :backtrace=>["/usr/share/logstash/logstash-core/lib/logstash/settings.rb:32:in `get_setting'", "/usr/share/logstash/logstash-core/lib/logstash/settings.rb:65:in `set_value'", "/usr/share/logstash/logstash-core/lib/logstash/settings.rb:84:in `block in merge'", "org/jruby/RubyHash.java:1343:in `each'", "/usr/share/logstash/logstash-core/lib/logstash/settings.rb:84:in `merge'", "/usr/share/logstash/logstash-core/lib/logstash/settings.rb:133:in `validate_all'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:277:in `execute'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/clamp-0.6.5/lib/clamp/command.rb:67:in `run'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:232:in `run'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/clamp-0.6.5/lib/clamp/command.rb:132:in `run'", "/usr/share/logstash/lib/bootstrap/environment.rb:71:in `<main>'"]}