Custom update handler?

[Jack Park]

With 4.1, not in cloud configuration, I have a custom response handler
chain which injects an additional handler for studying the documents
as they come in. But, when I do partial updates on those documents, I
don't want them to be studied again, so I created another version of
the same chain, but without my added feature. I named it "/partial".

When I create an instance of SolrJ for the url <server>/solr/partial,
I get back this error message:

Server at http://localhost:8983/solr/partial returned non ok
status:404, message:Not Found
{locator=2146fd50-fac9-47d5-85c0-47aaeafe177f,
tuples={set=99edfffe-b65c-4b5e-9436-67085ce49c9c}}

Here is the configuration for that:

<updateRequestProcessorChain name="/partial" default="false">
      <processor class="solr.RunUpdateProcessorFactory"/>
      <processor class="solr.LogUpdateProcessorFactory"/>
</updateRequestProcessorChain>

The normal handler chain is this:

<updateRequestProcessorChain name="harvest" default="true">
      <processor class="solr.RunUpdateProcessorFactory"/>
      <processor
class="org.apache.solr.update.TopicQuestsDocumentProcessFactory">
        <str name="inputField">hello</str>
      </processor>
      <processor class="solr.LogUpdateProcessorFactory"/>
</updateRequestProcessorChain>

which runs on a SolrJ set for  http://localhost:8983/solr/

What might I be missing?

Many thanks
Jack