Apache NiFi RecordPath Guide
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Converts a value to a String, using the given character set if the input type is "bytes". For example, given a schema such as:

  "type": "record",
  "name": "events",
  "fields": [
    { "name": "name", "type": "string" },
    { "name": "bytes", "type" : "bytes"}

and a record such as:

  "name" : "My Event",
  "bytes" : "Hello World!"

The following record path would parse the bytes field into a String:

toString( /bytes, "UTF-8")