public int getTargetDocsPerChunk() {
    return _targetDocsPerChunk;
  }
@Test
  public void withNegativeTargetDocsPerChunk()
      throws JsonProcessingException {
    String confStr = "{\"targetDocsPerChunk\": \"-1\"}";
    ForwardIndexConfig config = JsonUtils.stringToObject(confStr, ForwardIndexConfig.class);

    assertEquals(config.getTargetDocsPerChunk(), -1, "Unexpected defaultTargetDocsPerChunk");
  }