Why isn't Node App I wrote using Javascript SDK filtering on extracted fields when searching?

Hello, I am using JS SDK for Splunk, and have written a Node App. Now when I do a search, I get the results back, but I would like to remove duplicates and would like to use `dedup` on extracted fields. When I use this it does not work, but the same search string works fine on GUI and returns unique events. When I use head , it works, but when I use dedup i get no results. Splunk "version":"6.5.2" Search String : `search index=aaa filter1 filter2 | dedup extractedField1`