title: How can copy 2 fields data to one field on Solr
body: <p>I have a document in solr with <code>Lat</code> and <code>Lng</code> fields. I need to add a new field called <code>store</code> containing data taken from both the <code>Lat</code> and <code>Lng</code>. I tried to use <code>copyField</code> field but I got the error:</p>
  
  <blockquote>
    <p>Field store is not multivalued and destination for multiple copyFields (2)</p>
  </blockquote>
  
  <p>Here is my configuration:</p>
  
  <pre><code>&lt;fields&gt;
    &lt;field name="lat" type="sdouble" indexed="true" stored="true" required="true" multiValued="false" /&gt;
    &lt;field name="lng" type="sdouble" indexed="true" stored="true" required="true" multiValued="false" /&gt; 
    &lt;field name="store" type="text" indexed="true" stored="true"/&gt;
  &lt;/fields&gt; 
  
  &lt;copyField source="lat" dest="store"/&gt; 
  &lt;copyField source="lng" dest="store"/&gt; 
  </code></pre>
  
  <p>Is it possible to copy the content of two fields within the same destination field?</p>