title: Error during indexing with Apache Solr: multiple values encountered for non multiValued field keywords
body: <p>I'm trying to quickly index a large collection of html files for a once off information retrieval experiment with Apache Lucene Solr. I'm using the example Solr instance distributed with the latest release (<code>solr-4.9.0/example/solr</code>) and in the spirit of a quick and dirty solution I'm just submitting the documents with curl:</p>
  
  <pre><code>curl http://localhost:8983/solr/update/extract?literal.id=001 -F myfile=@blah.html
  </code></pre>
  
  <p>When I look at the logs in the Solr panel during indexing I see a lot of errors of the form:</p>
  
  <pre><code>org.apache.solr.common.SolrException: ERROR: [doc=BLOG06-20060103-014-0011844415] multiple values encountered for non multiValued field keywords: [hair care,​ shampoo,​ hair styles,​ hair styles,​ ...]
  </code></pre>
  
  <p>It looks like the component doing the keyword extraction is pulling out multiple values when  perhaps it should only be a list of words separated by whitespace. Do I need to do anything to force this, or does this look like some kind of bug?</p>