@Mustafa Ali Qizilbash We can achieve this case in two ways using UpdateRecord Processor ,QueryRecord processor Using UpdateRecord processor: As your data having Header so use Csv reader use Then use UpdateRecord processor with Replacement Value Strategy Record Path Value Then swap the record path value, add new property as /lowercase_filed_name /upper_lowercase_field_name Refer to this link for more details regards to UpdateRecord processor. Configure the Record Writer avro schema registry matching with your new filed names(i.e lowercase filed names). Then processor will swap the values from the record path and keep them to your new lowercase field names. 2.Using QueryRecord processor: Add new property in QueryRecord processor and keep the query as select col1,col2,col3.. from FLOWFILE Then configure the Record Writer controller service avro schema matching with the select statement column names(case sensitive), Then processor will write the flowfile with new filed names. For more details regards to convert record processor refer to this link. You can use either of these methods choose which is better fit for your case. I tried some simple flow using both processors, Use the attached flow xml as a reference and change per your case 222899-updaterecord-queryrecord.xml ... View more