Major Seems to have a Solr bug, when a copy field is defined with a source which comes from a dynamic field, it is accepted, but it can no longer be cleared then
{delete-copy-field={source=page-content-types_s_dv, dest=[pseudoContentTypes_dv]}, errorMessages=[Copy field directive not found: 'page-content-types_s_dv' -> 'pseudoContentTypes_dv'
]}
