title: Sunspot/Solr not able to search by boolean value
body: <p>I have a RoR model with a boolean field:</p>
  
  <pre><code>field :active, :type =&gt; Boolean
  </code></pre>
  
  <p>Which is listed in the searchable block:</p>
  
  <pre><code>searchable do
    boolean :active
  </code></pre>
  
  <p>And also in the search query:</p>
  
  <pre><code>s = Document.search do
    with(:active, true)
  end
  </code></pre>
  
  <p>And also in my Solr schema.xml file:</p>
  
  <pre><code>&lt;field name="active_b" type="boolean" indexed="true" stored="true"/&gt;
  </code></pre>
  
  <p>The issue is that my search is not restricting the results to only documents with active set to true. This is working in my local development environment but not in Heroku.</p>
  
  <p>Any ideas?</p>