ASF GitHub Bot commented on NIFI-4853:

Github user pvillard31 commented on the issue:

    +1, merging to master, ran some tests on a local Mongo, all looks good. 

> PutMongoRecord doesn't handle nested records
> --------------------------------------------
>                 Key: NIFI-4853
>                 URL: https://issues.apache.org/jira/browse/NIFI-4853
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Extensions
>            Reporter: Matt Burgess
>            Assignee: Matt Burgess
>            Priority: Major
> PutMongoRecord works well with flat records, but when attempting to put in 
> nested records (records whose fields are arrays or records themselves), the 
> Mongo serializer doesn't know how to handle the complex NiFi record field 
> types (such as MapRecord).
> The fix is to traverse all fields in the record, transforming the fields (if 
> necessary) to Java objects for use by the Mongo serializer(s). Something very 
> similar was done for PutDruidRecord, and in fact there is a utility method 
> DataTypeUtils.convertRecordFieldtoObject() that can perform this task.

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