final String item1Id = item1.getId();
            if (mergedIdSet.contains(item1Id)) {
                continue;
            }

            SuggestItem mergedItem = item1;
            for (final SuggestItem item2 : items) {
                if (item1.equals(item2)) {
                    continue;
                }

                final String item2Id = item2.getId();

                    + ((ByteArrayOutputStream) out2).toString(CoreLibConstants.UTF_8);
        } catch (final IOException e) {
            throw new SuggesterException("Failed to serialize SuggestItem to bulk line format: itemId=" + item.getId(), e);
        }
    }

    private static OutputStream getXContentOutputStream(final Map<String, Object> firstLineMap) throws IOException {