Files uploaded for indexing are not stored in their original form and cannot be downloaded. You can, however, create a search to collect the data from that file and then export it in CSV format. A sample search would be index=foo source=myFile | table <fields in the original file>. Once you have the table looking the way you want it, click the export icon and fill in the dialog box to create a CSV file.
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If this reply helps you, Karma would be appreciated.
