don't log when binaryDocValues == null

src/main/java/com/uas/search/sort/DefaultFieldComparator.java

@@ -65,9 +65,6 @@ abstract class DefaultFieldComparator extends SimpleFieldComparator<String> {
     @Override
     protected void doSetNextReader(LeafReaderContext context) throws IOException {
         binaryDocValues = context.reader().getBinaryDocValues(fieldname);
-        if (binaryDocValues == null) {
-            logger.error("索引中不存在 binaryDocValues ：" + fieldname);
-        }
     }
 
     @Override