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Trouble installing the plugin under Logstash 2.4.0 with the message "duplicate gems"? See https://github.com/elastic/logstash/issues/5852

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## Expected & Actual Behavior
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## Your Environment
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* Version of plugin used: 
* Version of Logstash used:  
* Database engine & version you're connecting to: 
* Have you checked you've met the Logstash requirements for Java versions?: