context.xml

<route id="report_month_to_date">
    <from uri="file:partials" />
    <unmarshal><csv/></unmarshal>
    <to uri="bean:myCsvHandler?method=doHandleCsvData" />
    <aggregate strategyRef="serviceStrategy">
        <correlationExpression>
            <simple>${header.month} == ${date:now:yyyyMM}</simple>
        </correlationExpression>
        <completionPredicate>
            <simple>${header.CamelBatchComplete}</simple>
        </completionPredicate>
        <to uri="file:reports/?fileName=${header.month}.csv" />
    </aggregate>
</route>