Transforming fields to date type

I have a database which I would like to add to Elasticsearch. In there, all documents have a field "date" however, it is not in a format that Elasticsearch considers as a date. It is of the form 01-2013 (for January 2013).

What is the best option. Should I modify my db and then add or would it be better to do it as I add my documents? (using the pipeline API if I understand things correctly

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