The thing is that I have already multiple filter.
first csv filter for : [fields][log_type1]_1.csv, [fields][log_type1]_2.csv, [fields][log_type1]_3.csv
second csv filter for: [fields][log_type2]_1.csv, [fields][log_type2]_2.csv, [fields][log_type2]_3.csv
I have 7 csv filter.
But for the same log type, sometime a new field appear.
It is working well when i restart logstash between 2 csv files with same [fields][log_type], the csv header is recreated.