title: Install and Configure apache Solr - Indexing failed on following nodes, missing required field entity type
body: <p>I am working on Pressflow Drupal 6, Debian, Apache2, PHP 5.3.3 environment. Trying to set up Solr on it. Followed step 9. Install and Configure apache Solr <a href="http://groups.drupal.org/pantheon/mercurywiki" rel="nofollow">http://groups.drupal.org/pantheon/mercurywiki</a> </p>
  
  <ol>
  <li>Install Tomcat6</li>
  <li>Install Apache Solr</li>
  <li>drush dl apachesolr</li>
  <li>move Drupal specific config and schema files to solr/conf/</li>
  </ol>
  
  <p>Now when I run cron </p>
  
  <pre><code>50% of the site has been indexed. There are 50 items left to index. 
  </code></pre>
  
  <p>After that it fires an Apache Solr error (in 'Reports log entry')</p>
  
  <pre><code>Indexing failed on one of the following nodes: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20 
  "400" Status: Document_tq3l64node1_missing_required_field_entity_type: Document_tq3l64node1_missing_required_field_entity_type
  
  
  Error 400 
  
  HTTP ERROR: 400Document [tq3l64/node/1] missing required field: entity_type
  RequestURI=/solr/iexplore/updatePowered by Jetty://
  </code></pre>
  
  <p>Can you please help, why i am getting this issue and what is fix ?</p>