use getDocBuilder()

git-svn-id: https://svn.apache.org/repos/asf/lucene/solr/trunk@888273 13f79535-47bb-0310-9956-ffa450edef68

contrib/dataimporthandler/src/main/java/org/apache/solr/handler/dataimport/ContextImpl.java

@@ -215,6 +215,9 @@ public class ContextImpl extends Context {
     } 
   }
 
+  DocBuilder getDocBuilder(){
+    return docBuilder;
+  }
   public Object resolve(String var) {
     return resolver.resolve(var);
   }