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=> [
                                "device_dev_name",
                                "device_family_name",
                                "device_hashed_mac",
                                "device_os_name",
                                "device_type_name",
                                "device_vendor_name",
                                "event_protocol_id",
                                "event_flow_outbound_or_inbound",
                                "event_role_device_or_router",
                                "event_role_server_or_client",
                                "event_rule_category",
                                "event_rule_id",
                                "event_rule_name",
                                "event_rule_reference",
                                "event_rule_severity",
                                "event_self_ipv4",
                                "event_time",
                                "router_ip"
                        ]
                #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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