[2017-05-11T12:35:56,772][ERROR][logstash.filters.grok ] Unknown setting 'pattern_definitions' for grok
[2017-05-11T12:35:56,795][ERROR][logstash.agent ] Cannot create pipeline {:reason=>"Something is wrong with your configuration."}
The pattern_definitions grok option is only available in recent versions of the grok filter. Try updating it. Otherwise you can put the pattern in a pattern file.
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