Nifi, how to produce via Kafka avro files with multiple records each file

Question

I created a pipeline that handles a single json file (a vector of 5890 elements, each a record) and send it via Kafka in avro format. The producer works fine, then when I read it with a consumer I get a flowfile (a avro file) each record. 5890 avro files. How can I set or merge more records in a single avro file?

I simply use a PublishKafkaRecord_0_10 1.5.0 (jsonTreeReader 1.5.0 and AvroRecordSetWriter 1.5.0) and ConsumeKafka_0_10 1.5.0 .