SolrCloud 8.2.0 - adding a field

[Joe Obernberger]

Hi All - I'm trying this:

curl -X POST -H 'Content-type:application/json' --data-binary 
'{"add-field":{"name":"Para450","type":"text_general","stored":"false","indexed":"true","docValues":"false","multiValued":"false"}}' 
http://ursula.querymasters.com:9100/api/cores/UNCLASS/schema

This results in:

{
  "error":{
    "metadata":[
      "error-class","org.apache.solr.common.SolrException",
      "root-error-class","org.apache.solr.common.SolrException"],
    "msg":"no core retrieved for UNCLASS",
    "code":404}}

I've also tried going to api/c:

curl -X POST -H 'Content-type:application/json' --data-binary 
'{"add-field":{"name":"Para450","type":"text_general","stored":"false","indexed":"true","docValues":"false","multiValued":"false"}}' 
http://ursula.querymasters.com:9100/api/c/UNCLASS/schema

results in:

{
  "error":{
    "metadata":[
      "error-class","org.apache.solr.common.SolrException",
      "root-error-class","org.apache.solr.common.SolrException"],
    "msg":"no such collection or alias",
    "code":400}}

What am I doing wrong?  The schema UNCLASS does exist in Zookeeper.

Thanks!

-Joe