title: Error while indexing in solr data crawled by nutch
body: <p>I have starting working with nutch and solr and I have a problem with integrating Solr with Nutch. I followed this tutorial: <a href="http://wiki.apache.org/nutch/NutchTutorial" rel="nofollow">http://wiki.apache.org/nutch/NutchTutorial</a> and after using:
  <code>bin/nutch crawl urls -solr http://localhost:8983/solr/ -depth 3 -topN 5</code>
  nutch shows message: </p>
  
  <blockquote>
    <p>java.io.IOException: Job failed!</p>
  </blockquote>
  
  <p>and solr is showing: </p>
  
  <blockquote>
    <p>SEVERE: org.apache.solr.common.SolrException: ERROR:
    [doc=http://nutch.apache.org/] unknown field 'host'</p>
  </blockquote>
  
  <p>I thought that the reason might be a missing 'host' field in the $SOLR_HOME/example/solr/conf/schema.xml but it is there.
  I would be very grateful for your help.</p>