in-place atomic updates for numeric docValue field

[Dan .]

Hi,

I have a field like this:

<fieldType name="integer" class="solr.TrieIntField" omitNorms="true"/>
<field name="popularity" type="integer" indexed="false" stored="false"
docValues="true" multiValued="false"/>

so I can do a fast in-place atomic updates

However if I do e.g.

curl -H 'Content-Type: application/json'
'http://localhost:8983/solr/collection/update?commit=true'
--data-binary '
[{
 "id":"my_id",
 "popularity":{"set":null}
}]'

then I'd expect the popularity field to be removed, however it's not.

I this a bug? or is there a know workaround for this for in-place atomic
updates?

Cheers,
Dan