Maximum length of the CSV column parameter

I have 18 headers when I set columns, but the index for kibana only shows 13 why?
My settings:

filter {
        csv {
                separator => ","
                #autogenerate_column_names=> true
                columns=> [
                #skip_header=> false
                #autodetect_column_names=> true
                #skip_empty_columns=> true
                #skip_empty_rows=> true
                #periodic_flush => true
                id => "csv"
                convert => {
                        "event_protocol_id" => "integer"


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