How to convert multiple json flowfiles into single csv using nifi?

[#1]

Hi Friends,

I have scenario,  where I m using the getMongo processor to read all documents(rows) present in the mongodb colelction.

The getMongo is reading one document as one flow file, suppose in a collection if I have 50 documents(rows), then each row is reading as one flowfile(50 flowfiles).

Now I want to convert each flowfile into csv type and put into only one flowfile(csv file). How to do that?

GetMogo-->convertrecord ?