title: Merge two Documents in Solr
body: <p>I have two Documents(.csv), i want to merge it. Is it possible?</p>
  
  <p>Here a example</p>
  
  <p>Document1:</p>
  
  <pre><code>&lt;doc&gt;
   &lt;arr name="id"&gt;
    &lt;long&gt;200000000&lt;/long&gt;
   &lt;/arr&gt;
   &lt;arr name="Name"&gt;
    &lt;str&gt;Sample&lt;/str&gt;
   &lt;/arr&gt;
   &lt;arr name="first_name"&gt;
    &lt;str&gt;Sally&lt;/str&gt;
   &lt;/arr&gt;
  &lt;/doc&gt;
  </code></pre>
  
  <p>Document2: </p>
  
  <pre><code>&lt;doc&gt;
   &lt;arr name="id"&gt;
    &lt;long&gt;200000000&lt;/long&gt;
   &lt;/arr&gt;
   &lt;arr name="Street"&gt;
    &lt;str&gt;Any Street&lt;/str&gt;
   &lt;/arr&gt;
   &lt;arr name="State"&gt;
    &lt;str&gt;Any State&lt;/str&gt;
   &lt;/arr&gt;
  &lt;/doc&gt;
  </code></pre>
  
  <p>It should look like this:</p>
  
  <pre><code>&lt;doc&gt;
   &lt;arr name="id"&gt;
    &lt;long&gt;200000000&lt;/long&gt;
   &lt;/arr&gt;
   &lt;arr name="Name"&gt;
    &lt;str&gt;Sample&lt;/str&gt;
   &lt;/arr&gt;
   &lt;arr name="first_name"&gt;
    &lt;str&gt;Sally&lt;/str&gt;
   &lt;/arr&gt;
   &lt;arr name="Street"&gt;
    &lt;str&gt;Any Street&lt;/str&gt;
   &lt;/arr&gt;
   &lt;arr name="State"&gt;
    &lt;str&gt;Any State&lt;/str&gt;
   &lt;/arr&gt;
  &lt;/doc&gt;
  </code></pre>
  
  <p>How can I do this in Solr? Should I create a second core and merge it somehow?
  Or what can I do?</p>