File input documentation for logstash 2.2

I recently updated to logstash-2.2 and found this in the log soon after startup:
:message=>"Reached open files limit: 4095, set by the 'max_open_files' option

I don't see the max_open_files option in: enter link description here

but did find it in: /opt/logstash/vendor/bundle/jruby/1.9/gems/logstash-input-file-2.2.0/

How often/soon after a release is online documentation updated (assuming I was looking in the wrong place)?


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