title: Solr Error This Indexschema is not mutable
body: <p>I want to use the schema.xml rather than the managed schema so I changed the following in the solrconfig.xml to the below</p>
  
  <pre><code>&lt;schemaFactory class="ManagedIndexSchemaFactory"&gt;
      &lt;bool name="mutable"&gt;true&lt;/bool&gt;
      &lt;str name="managedSchemaResourceName"&gt;managed-schema&lt;/str&gt;
    &lt;/schemaFactory&gt;
  </code></pre>
  
  <p>to</p>
  
  <pre><code>&lt;schemaFactory class="ClassicIndexSchemaFactory"/&gt; 
  </code></pre>
  
  <p>But I get  The indexschema is not mutable error when I try to Index a flat file using the post command.</p>