Today we prevent DV updates for non-existing fields except
of the soft deletes case. Yet, this can cause inconsitent field numbers
etc. since we don't go through the global field number map etc. This
change removes the limitation of updating DVs in docs even if the field
doesn't exists. This also has the benefit that the error messages if
the field type doesn't match is consistent with what DWPT throws.
- is related to
SOLR-12368 in-place DV updates should no longer have to jump through hoops if field does not yet exist