static boolean isStreamFile(final Path path) {
        // A simple test to avoid hitting the fs to distinguish between a file and a directory
        return NullSafe.test(path, path2 ->
                path2.getFileName().toString().contains(FILE_SEPARATOR_CHAR));
    }
We use this rather than the File.separator as we need to be standard
across Windows and UNIX.
stroom-data/stroom-data-store-impl-fs/src/main/java/stroom/data/store/impl/fs/FsPathHelper.java