Combining two column in graph

Hi All,
I loaded some sales data in elastic search using log stash ,and after date in kibana i created one visualization <img src="//cdck-file-uploads-global.s3.dualstack.us-west-2.amazonaws.com/elastic/original/3X/6/7/67b7666574f0fb9dcc7ab0bf43a9ba571c16955f.JPG" width="690" height="441"
currently X axis only show item code but i want to show itemcode + "_" +Itemname .
how can i achieve this , any suggestion will be appreciated .
thanks

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