How to close the file handler when using Files.newDirectoryStream() in java 8

We have a linux app where we are not able to unmount a USB drive because of the below call. Is there a file resource I need to properly close the stream?

     Files.newDirectoryStream(
         Paths.get(importDir), 
         path -> path.toString().endsWith(".ini") && path.toFile().isFile())
            .forEach(path -> importItems.add(path));

here is the output from the response:

umount: /media/flashdrive: target is busy
    (In some cases useful info about processes that
     use the device is found by lsof(8) or fuser(1).)

we are currently using java 8.

You need to close the directory stream that you open:

Failure to close the stream may result in a resource leak. The try-with-resources statement provides a useful construct to ensure that the stream is closed

_{https://docs.oracle.com/javase/8/docs/api/java/nio/file/DirectoryStream.html}

    try (DirectoryStream<Path> paths = Files.newDirectoryStream(
            Paths.get(importDir),
            path -> path.toString().endsWith(".ini") && path.toFile().isFile())) {

        paths.forEach(path -> importItems.add(path));
    }

Another way is calling paths.close() directly.