github.com/tooolbox/migrate/v4@v4.6.2-0.20200325001913-461b03b92064/database/mongodb/examples/migrations/003_add_new_field.down.json (about)

     1  [
     2      {
     3          "update": "users",
     4          "updates": [
     5              {
     6                  "q": {},
     7                  "u": {
     8                      "$unset": {
     9                          "status": ""
    10                      }
    11                  },
    12                  "multi": true
    13              }
    14          ]
    15      }
    16  ]