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how to merge content of many flowfile inputstream to one one flowfile outputstream

how to merge content of many flowfile inputstream to one one flowfile outputstream

New Contributor

Hello all, how to merge content of many flowfile inputstream to one one flowfile outputstream. for example i get 50 flowfiles and a don't want to to transfert 50 flowfiles results but just one flowfile .... i have tried to use session.get(50) and remove all flowfile after reading their inpustream but there is an error ....