protected void validateResponse(
      TermVectorResponse esResponse, Fields luceneFields, TestConfig testConfig)
      throws IOException {
    TestDoc testDoc = testConfig.doc;
    HashSet<String> selectedFields =
        testConfig.selectedFields == null
            ? null
            : new HashSet<String>(Arrays.asList(testConfig.selectedFields));
    Fields esTermVectorFields = esResponse.getFields();
    for (TestFieldSetting field : testDoc.fieldSettings) {
      Terms esTerms = esTermVectorFields.terms(field.name);
      if (selectedFields != null && !selectedFields.contains(field.name)) {
        assertNull(esTerms);
        continue;
      }

      assertNotNull(esTerms);

      Terms luceneTerms = luceneFields.terms(field.name);
      TermsEnum esTermEnum = esTerms.iterator(null);
      TermsEnum luceneTermEnum = luceneTerms.iterator(null);

      while (esTermEnum.next() != null) {
        assertNotNull(luceneTermEnum.next());

        assertThat(esTermEnum.totalTermFreq(), equalTo(luceneTermEnum.totalTermFreq()));
        DocsAndPositionsEnum esDocsPosEnum = esTermEnum.docsAndPositions(null, null, 0);
        DocsAndPositionsEnum luceneDocsPosEnum = luceneTermEnum.docsAndPositions(null, null, 0);
        if (luceneDocsPosEnum == null) {
          // test we expect that...
          assertFalse(field.storedOffset);
          assertFalse(field.storedPayloads);
          assertFalse(field.storedPositions);
          continue;
        }

        String currentTerm = esTermEnum.term().utf8ToString();

        assertThat(
            "Token mismatch for field: " + field.name,
            currentTerm,
            equalTo(luceneTermEnum.term().utf8ToString()));

        esDocsPosEnum.nextDoc();
        luceneDocsPosEnum.nextDoc();

        int freq = esDocsPosEnum.freq();
        assertThat(freq, equalTo(luceneDocsPosEnum.freq()));
        for (int i = 0; i < freq; i++) {
          String failDesc = " (field:" + field.name + " term:" + currentTerm + ")";
          int lucenePos = luceneDocsPosEnum.nextPosition();
          int esPos = esDocsPosEnum.nextPosition();
          if (field.storedPositions && testConfig.requestPositions) {
            assertThat("Position test failed" + failDesc, lucenePos, equalTo(esPos));
          } else {
            assertThat("Missing position test failed" + failDesc, esPos, equalTo(-1));
          }
          if (field.storedOffset && testConfig.requestOffsets) {
            assertThat(
                "Offset test failed" + failDesc,
                luceneDocsPosEnum.startOffset(),
                equalTo(esDocsPosEnum.startOffset()));
            assertThat(
                "Offset test failed" + failDesc,
                luceneDocsPosEnum.endOffset(),
                equalTo(esDocsPosEnum.endOffset()));
          } else {
            assertThat(
                "Missing offset test failed" + failDesc, esDocsPosEnum.startOffset(), equalTo(-1));
            assertThat(
                "Missing offset test failed" + failDesc, esDocsPosEnum.endOffset(), equalTo(-1));
          }
          if (field.storedPayloads && testConfig.requestPayloads) {
            assertThat(
                "Payload test failed" + failDesc,
                luceneDocsPosEnum.getPayload(),
                equalTo(esDocsPosEnum.getPayload()));
          } else {
            assertThat(
                "Missing payload test failed" + failDesc,
                esDocsPosEnum.getPayload(),
                equalTo(null));
          }
        }
      }

      assertNull("Es returned terms are done but lucene isn't", luceneTermEnum.next());
    }
  }