Error while importing 5k files via ydb import

Error while importing 5k files via ydb import

```
 ~/ydb  -e grpc://DB:2135 -d /path import file  csv *.csv --path destination
```

But receive an error 

```
(Error 24: Too many open files) util/system/file.cpp:936: can't open "1924000000.csv" with mode RdOnly|Seq (0x00000028)
```