How can i send particular field to csv using logstash 2.4.0?

I have so many fields in logstash which i matched with grok filter but in that i want only one field to be taken to csv.

fields like timestamp,item name,cost,description etc..
in that i want only item name to be sent to csv .
May i know in mutate which feature i have to use to get this done/


If you use the csv output there's a fields option that allows you to choose which fields to include in the CSV output.

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