On upgrading to solr 8.3 also I am facing the same issue as SOLR-13523. 
I have added these on my schema
    <field name="_root_" type="string" indexed="true" stored="true"
docValues="false" />
    <fieldType name="_nest_path_" class="solr.NestPathField"
maxCharsForDocValues="-1" />
    <field name="_nest_path_" type="_nest_path_" indexed="true"
stored="true" docValues="false" />
    <field name="_nest_parent_" type="string" indexed="true" stored="true"/>

Document present in solr:
[{
   "id": "parent1",
   "isInStock": 1,
   "parent": true,
   "_childDocuments_": [
     {
         "id": "child 1",
         "isInStock": 0,
         "parent": false
     }
   ]
 }]

On doing atomic update I am getting this
<https://lucene.472066.n3.nabble.com/file/t495295/Screenshot_2019-11-19_at_5.png>
 






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