@Field
    public void setBasePath(String basePath) {
        this.basePath = Paths.get(basePath);
    }
Default behavior si that clients will send in relative paths, this
must be set to allow this fetcher to fetch the
full path.

@param basePath
tika-core/src/main/java/org/apache/tika/pipes/fetcher/fs/FileSystemFetcher.java