I may be having the same problem. I took an existing filter, renamed it and all its contents, and am trying "bundle install'. This fails with no useful message.
bundle list says "Could not find gem 'logstash-devutils (>= 0) ruby' in the gems available on this machine."
I have downloaded that gem from rubygems.org, its called logstash-devutils-0.0.19-java.gem.
Installing that gem gives:
ERROR: Error installing logstash-devutils-0.0.19-java.gem:
logstash-devutils requires rspec (~> 3.1.0, runtime)
Installing that gem works, here is "gem list":
[root@system software]# gem list
*** LOCAL GEMS ***
It seems that bundle is missing rspec, but "gem list" shows it installed.
I'm new go Ruby so any help would be great.