I got below error when i tried sample event output through the stdout plugin with rubydebug codec.
"Failed action. {:status=>400, :action=>["index", {:_id=>nil, :_index=>"logstash-2016.01.29", :_type=>"logs", :_routing=>nil}, #<LogStash::Event:0x2efa5a8b @metadata_accessors=#<LogStash::Util::Accessors:0x38ad4c74 @store={}, @lut={}>, @cancelled=false, @data={"message"=>"This is a sample", "@version"=>"1", "@timestamp"=>"2016-01-29T13:25:48.826Z", "host"=>"ip-20-334-233-111.ec2.internal"}, @metadata={}, @accessors=#<LogStash::Util::Accessors:0x7021aced @store={"message"=>"This is a sample", "@version"=>"1", "@timestamp"=>"2016-01-29T13:25:48.826Z", "host"=>"ip-20-334-233-111.ec2.internal"}, @lut={"host"=>[{"message"=>"This is a sample", "@version"=>"1", "@timestamp"=>"2016-01-29T13:25:48.826Z", "host"=>"ip-20-334-233-111.ec2.internal"}, "host"], "type"=>[{"message"=>"This is a sample", "@version"=>"1", "@timestamp"=>"2016-01-29T13:25:48.826Z", "host"=>"ip-20-334-233-111.ec2.internal"}, "type"]}>>], :response=>{"index"=>{"_index"=>"logstash-2016.01.29", "_type"=>"logs", "_id"=>nil, "status"=>400, "error"=>{"type"=>"mapper_parsing_exception", "reason"=>"Failed to parse mapping [default]: Mapping definition for [geoip] has unsupported parameters: [path : full]", "caused_by"=>{"type"=>"mapper_parsing_exception", "reason"=>"Mapping definition for [geoip] has unsupported parameters: [path : full]"}}}}, :level=>:warn}"