now, generated CSV file has skip fields that are NULL in elasticsearch's document and that presents an issue as I can't really identify these fields, as generated file's fields are out of order...
How can I include field-names into generated CSV file at the top?
Thanks to darkmoonvt@IRC, the answer was easier than I thought) and even though it doesn't add field-names on top of CSV file, at least now each field is identifiable)
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