protected ParallelFileProcessingResult run(BatchProcess process) throws Exception {
        ExecutorService executor = Executors.newFixedThreadPool(1);
        Future<ParallelFileProcessingResult> futureResult = executor.submit(process);
        return futureResult.get(10, TimeUnit.SECONDS);
    }
helper method equivalent to File#listFiles()
grabs children only, does not walk recursively

@param p
@return
tika-batch/src/test/java/org/apache/tika/batch/fs/FSBatchTestBase.java