curl --request GET \
  --url https://api.example.com/v2/knowledge-bases/{kb_id}/documents

{
  "data": [
    {
      "filename": "<string>",
      "file_type": "<string>",
      "id": "<string>",
      "document_type": "file",
      "document_languages": [
        "en"
      ]
    }
  ],
  "next_page_token": "<string>"
}