The Flatten Single Message Transform (SMT) is useful when you need to collapse a nested message down to a flat structure.
To use the Single Message Transform you only need to reference it; there’s no additional configuration required:
" transforms " : " flatten " ,
" transforms.flatten.type " : " org.apache.kafka.connect.transforms.Flatten$Value "
Read more: 🎄 Twelve Days of SMT 🎄 - Day 3: Flatten