change log level from info to error

tsdb/engine/tsm1/engine.go

@@ -2214,7 +2214,7 @@ func (s *compactionStrategy) compactGroup() {
 		// Remove the new snapshot files. We will try again.
 		for _, file := range files {
 			if err := os.Remove(file); err != nil {
-				log.Info("Unable to remove file", zap.String("path", file), zap.Error(err))
+				log.Error("Unable to remove file", zap.String("path", file), zap.Error(err))
 			}
 		}
 		return