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# Document Fields that control Processing

You can customize the way that CFS processes a document by adding the following fields to the document. These fields are read by CFS and control processing. You can add a field to a document using a Lua script, configured to run on a Pre Import Task. Unless stated otherwise, the field can have any value.

Document Field | Description
--- | ---
`AUTN_NO_FILTER` | To prevent CFS extracting text, add this field to a document. This field can be useful if you do not want to extract text from certain file types.
`AUTN_NO_EXTRACT` | To prevent CFS extracting subfiles, add this field to a document. This can be useful if you want to avoid fetching documents from inside a ZIP file.
`AUTN_NEEDS_MEDIA_SERVER_ANALYSIS` | To run analysis on media files using the `MediaServerAnalysis` import task, you must add the field `AUTN_NEEDS_MEDIA_SERVER_ANALYSIS` to the documents. The `MediaServerAnalysis` task only runs on documents that have this field.

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