Still see document after delete with commit in solr 4.0

[Paul]

I've recently upgraded to solr 4.0 from solr 3.5 and I think my delete
statement used to work, but now it doesn't seem to be deleting. I've
been experimenting around, and it seems like this should be the URL
for deleting the document with the uri of "network_24".

In a browser, I first go here:

http://localhost:8983/solr/MYCORE/update?stream.body=%3Cdelete%3E%3Cquery%3Euri%3Anetwork_24%3C%2Fquery%3E%3C%2Fdelete%3E&commit=true

I get this response:

<response>
  <lst name="responseHeader">
    <int name="status">0</int>
    <int name="QTime">5</int>
  </lst>
</response>

And this is in the log file:

(timestamp) org.apache.solr.update.DirectUpdateHandler2 commit
INFO: start 
commit{flags=0,_version_=0,optimize=false,openSearcher=true,waitSearcher=true,expungeDeletes=false,softCommit=false}
(timestamp) org.apache.solr.search.SolrIndexSearcher <init>
INFO: Opening Searcher@646dd60e main
(timestamp) org.apache.solr.update.DirectUpdateHandler2 commit
INFO: end_commit_flush
(timestamp) org.apache.solr.core.QuerySenderListener newSearcher
INFO: QuerySenderListener sending requests to Searcher@646dd60e
main{StandardDirectoryReader(segments_2v:447 _4p(4.0.0.1):C3244)}
(timestamp) org.apache.solr.core.QuerySenderListener newSearcher
INFO: QuerySenderListener done.
S(timestamp) org.apache.solr.core.SolrCore registerSearcher
INFO: [MYCORE] Registered new searcher Searcher@646dd60e
main{StandardDirectoryReader(segments_2v:447 _4p(4.0.0.1):C3244)}
(timestamp) org.apache.solr.update.processor.LogUpdateProcessor finish
INFO: [MYCORE] webapp=/solr path=/update
params={commit=true&stream.body=<delete><query>uri:network_24</query></delete>}
{deleteByQuery=uri:network_24,commit=} 0 5

But if I then go to this URL:

http://localhost:8983/solr/MYCORE/select?q=uri%3Anetwork_24&wt=xml

I get this response:

<response>
  <lst name="responseHeader">
    <int name="status">0</int>
    <int name="QTime">1</int>
    <lst name="params">
      <str name="wt">xml</str>
      <str name="q">uri:network_24</str>
    </lst>
  </lst>
  <result name="response" numFound="1" start="0">
    <doc>
      <str name="name">network24</str>
      <str name="uri">network_24</str>
    </doc>
  </result>
</response>

Why didn't that document disappear?