Message message = item.getMessage();
Map<String, Object> doc = Maps.newHashMap();
doc.put("letter_id", item.getId());
doc.put("timestamp", Tools.iso8601());
doc.put("message", message.toElasticSearchObject());
PersistedDeadLetter persistedDeadLetter = new PersistedDeadLetterImpl(doc);
persistedDeadLetterService.saveWithoutValidation(persistedDeadLetter);
written = true;
} catch(Exception e) {