Really struggling to get netflow going here, fresh centos 7 install not much configured and getting the following which goes beyond my comprehension.
I get the below when I run "bin/logstash --modules netflow --setup"
[INFO ] 2018-02-21 17:42:50.178 [Api Webserver] agent - Successfully started Logstash API endpoint {:port=>9600}
[ERROR] 2018-02-21 17:42:50.613 [Ruby-0-Thread-1: /usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/stud-0.0.23/lib/stud/task.rb:22] sourceloader - Could not fetch all the sources {:exception=>LogStash::ConfigLoadingError, :message=>"Failed to parse the module configuration: [[401] ]", :backtrace=>["/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/elasticsearch-transport-5.0.4/lib/elasticsearch/transport/transport/base.rb:202:in `__raise_transport_error'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/elasticsearch-transport-5.0.4/lib/elasticsearch/transport/transport/base.rb:319:in `perform_request'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/elasticsearch-transport-5.0.4/lib/elasticsearch/transport/transport/http/manticore.rb:67:in `perform_request'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/elasticsearch-transport-5.0.4/lib/elasticsearch/transport/client.rb:131:in `perform_request'", "/usr/share/logstash/logstash-core/lib/logstash/elasticsearch_client.rb:85:in `head'", "/usr/share/logstash/logstash-core/lib/logstash/elasticsearch_client.rb:55:in `can_connect?'", "/usr/share/logstash/logstash-core/lib/logstash/elasticsearch_client.rb:139:in `can_connect?'", "/usr/share/logstash/logstash-core/lib/logstash/config/modules_common.rb:76:in `block in pipeline_configs'", "org/jruby/RubyArray.java:1734:in `each'", "/usr/share/logstash/logstash-core/lib/logstash/config/modules_common.rb:56:in `pipeline_configs'", "/usr/share/logstash/logstash-core/lib/logstash/config/source/modules.rb:16:in `pipeline_configs'", "/usr/share/logstash/logstash-core/lib/logstash/config/source_loader.rb:59:in `block in fetch'", "org/jruby/RubyArray.java:2481:in `collect'", "/usr/share/logstash/logstash-core/lib/logstash/config/source_loader.rb:58:in `fetch'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:148:in `converge_state_and_update'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:90:in `execute'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:348:in `block in execute'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/stud-0.0.23/lib/stud/task.rb:24:in `block in initialize'"]}
[ERROR] 2018-02-21 17:42:50.614 [Ruby-0-Thread-1: /usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/stud-0.0.23/lib/stud/task.rb:22] agent - An exception happened when converging configuration {:exception=>RuntimeError, :message=>"Could not fetch the configuration, message: Failed to parse the module configuration: [[401] ]", :backtrace=>["/usr/share/logstash/logstash-core/lib/logstash/agent.rb:155:in `converge_state_and_update'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:90:in `execute'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:348:in `block in execute'", "/usr/share/logstash/vendor/bundle/jruby/2.3.0/gems/stud-0.0.23/lib/stud/task.rb:24:in `b