why solr commit with serval docs

[rulinma]

I use solrconfig.xml as follow:  
<updateHandler class="solr.DirectUpdateHandler2">
    <updateLog>
      <str name="dir">${solr.ulog.dir:}</str>
    </updateLog>
    <autoCommit> 
      <maxTime>15000</maxTime> 
          <maxDocs>5000</maxDocs>
      <openSearcher>false</openSearcher> 
    </autoCommit>
    <autoSoftCommit> 
       <maxTime>3600000</maxTime> 
           <maxDocs>500000</maxDocs>
    </autoSoftCommit>
  </updateHandler>

I use 2000 docs to commit once, but I query find that 2002,2003,2004 and so
on, not 2000,4000,6000 increase. I don't know why?
who can tell me ?
thanks!




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