*       channel have their own file descriptors. Generally this only happens when both channels
   *       are files or sockets. This performs zero copies - the bytes never enter userspace.
   *   <li>Use mmap(2) or equivalent. Requires that either the input channel or the output channel
   *       have file descriptors. Bytes are copied from the file into a kernel buffer, then directly

        assertThat(map.containsKey("3"), is(not(true)));
        map.put("3", null);
        assertThat(map.containsKey("3"), is(true));
    }

    /**
     * @throws Exception
     */
    @Test
    public void testIndexOf() throws Exception {
        assertThat(map.indexOf("test"), is(1));
        assertThat(map.indexOf(null), is(0));
        assertThat(map.indexOf("test3"), is(-1));

        Map<String, Object> parentMap = new LinkedHashMap<>();
        DocMap docMap = new DocMap(parentMap);

        docMap.put("c_key", "value_c");
        docMap.put("a_key", "value_a");
        docMap.put("lang", "en");
        docMap.put("b_key", "value_b");

        Set<Map.Entry<String, Object>> entrySet = docMap.entrySet();
        String[] keys = entrySet.stream().map(Map.Entry::getKey).toArray(String[]::new);

        final AtomicReference<String> sentIndex = new AtomicReference<>();
        final List<Map<String, Object>> sentDocList = new ArrayList<>();
        final SearchEngineClient client = new SearchEngineClient() {
            @Override
            public BulkResponse addAll(final String index, final List<Map<String, Object>> docList,
                    final BiConsumer<Map<String, Object>, IndexRequestBuilder> options) {
                sentIndex.set(index);

        return idList;
    }

    protected static List<Map<String, Object>> readJobLog(final String namePrefix) {
        final List<Map<String, Object>> logList = readLogItems("joblog");
        final List<Map<String, Object>> resList = new ArrayList<>();
        for (Map<String, Object> elem : logList) {

    }

    /**
     * Returns a query map for the specified virtual host.
     *
     * @param key The virtual host key.
     * @return A map of terms and boost information.
     */
    protected Map<String, List<Tuple3<String, QueryBuilder, ScoreFunctionBuilder<?>>>> getQueryMap(final String key) {
        final Map<String, List<Tuple3<String, QueryBuilder, ScoreFunctionBuilder<?>>>> map = keyMatchQueryMap.get(key);

     * @param map the document data map to process
     * @return the processed document map after applying all ingesters
     */
    protected Map<String, Object> ingest(final AccessResult<String> accessResult, final Map<String, Object> map) {
        if (ingestFactory == null) {
            return map;
        }
        Map<String, Object> target = map;

                final Map<String, Object> map = new HashMap<>();
                final Item item = result.get();
                final String objectName = item.objectName();
                map.put("id", encodeId(objectName));
                map.put("path", prefix);
                map.put("name", getName(objectName));
                map.put("hashCode", item.hashCode());

        }
    }

    @Override
    public boolean add(final Map<String, Object> e) {
        return parent.add(e);
    }

    @Override
    public void add(final int index, final Map<String, Object> element) {
        parent.add(index, element);
    }

    @Override
    public boolean addAll(final Collection<? extends Map<String, Object>> c) {
        return parent.addAll(c);
    }

                        final Map<String, String> map = new HashMap<>(2);
                        map.put(Constants.ITEM_LABEL, item.getLabel());
                        map.put(Constants.ITEM_VALUE, item.getValue());
                        itemList.add(map);
                        break;
                    }
                }
            }
        }

        return itemList;
    }

    /**