Github user MikeThomsen commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/2560#discussion_r175850266
  
    --- Diff: 
nifi-nar-bundles/nifi-mongodb-bundle/nifi-mongodb-processors/src/main/java/org/apache/nifi/processors/mongodb/PutMongo.java
 ---
    @@ -196,6 +237,33 @@ public void onTrigger(final ProcessContext context, 
final ProcessSession session
             }
         }
     
    +    private void removeUpdateKeys(String updateKeyParam, Map doc) {
    +        String[] parts = updateKeyParam.split(",[\\s]*");
    +        for (String part : parts) {
    +            if (part.contains(".")) {
    --- End diff --
    
    Yes. The only time it wouldn't apply is if a user wanted to remove a field 
like they misnamed the `username` field as `yusername`. They can fix that with:
    
    ```
    {
        "yusername": "....",
        "$set": {
             "username": ".....",
         },
         "$unset": {
             "yusername": 1
         }
    }
    ```


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