EQL - Simplify nested query where expressions after parsing

src/main/java/com/avaje/ebeaninternal/server/expression/DefaultExampleExpression.java

@@ -88,6 +88,11 @@ public class DefaultExampleExpression implements SpiExpression, ExampleExpressio
     }
   }
 
+  @Override
+  public void simplify() {
+    // do nothing
+  }
+
   @Override
   public void writeDocQuery(DocQueryContext context) throws IOException {
     if (!list.isEmpty()) {