suggester.indexer().indexFromDocument(() -> reader, 1000, () -> ThreadUtil.sleep(100)).then(response -> {
            numObInputDoc.set(response.getNumberOfInputDocs());
            latch.countDown();
        }).error(t -> {
            t.printStackTrace();
            latch.countDown();
            fail();
        });
        latch.await();
        assertEquals(num, numObInputDoc.get());

    <sub-class-of type="application/vnd.ms-cab-compressed" />
  </mime-type>

  <mime-type type="application/parityfec"/>
  <mime-type type="application/patch-ops-error+xml">
    <glob pattern="*.xer"/>
  </mime-type>

  <mime-type type="application/pdf">
    <alias type="application/x-pdf"/>
    <acronym>PDF</acronym>
    <_comment>Portable Document Format</_comment>