title: Add document insert timestamp to all documents
body: <p>I am using Solr 5.3.1 in schemaless mode. The server is running.</p>
  
  <p>I can <a href="https://stackoverflow.com/a/12346434/953327">add a <code>timestamp</code> field</a> to my managed-schema</p>
  
  <pre><code>&lt;field name="timestamp" type="date" indexed="true" stored="true" default="NOW" multiValued="false"/&gt;
  </code></pre>
  
  <p>By POST'ing to the <code>/schema</code> endpoint.</p>
  
  <p>That's fine. But afterwards, Solr doesn't automatically add the field to my documents when they are being inserted.</p>
  
  <p>Do I need to restart?</p>
  
  <p>Do I have to index the document with <code>timestamp</code> specified but blank?</p>
  
  <p>Is there a way to automatically add it to all documents regardless of if it has a <code>timestamp</code> attribute?</p>