date/processor/FieldMutatingUpdateProcessorFactory.html#init(org.apache.solr.common.util.NamedList)">FieldMutatingUpdateProcessorFactory</a></code></strong></div>
<div class="block">Handles common initialization related to source fields for 
 constructing the FieldNameSelector to be used.

 Will error if any unexpected init args are found, so subclasses should
 remove any subclass-specific init args before calling this method.</div>
<dl>
<dt><strong>Specified by:</strong></dt>
<dd><code><a href="../../../..