change log level when startFileIndex is invalid

src/main/java/com/uas/search/support/DownloadService.java

@@ -65,7 +65,7 @@ public class DownloadService<T> {
 
             int totalFiles = (int) Math.ceil(pageResult.getTotalElements() / (1.0 * SINGLE_FILE_MAX_SIZE));
             if (startFileIndex > totalFiles) {
-                logger.error(name + " startFileIndex 超过 " + totalFiles);
+                logger.info(name + " startFileIndex 超过 " + totalFiles);
                 return size;
             }
             // 实际的最后一个文件