Indexing documents in a batch

gistfile1.java

        public void execute() {
            int c = threadCounter.incrementAndGet();
            log.info("Starting a batch with {} items. ({} threads are running)", mails.size(), c);
            for (JsonMail mail : mails) {
                try {
                    IndexResponse indexResponse = ElasticSearchClient.getClient().prepareIndex()
                            .setIndex(indexName)
                            .setType("mail")
                            .setId(mail.getMessageId())
                            .setSource(mail.getJsoncontent())
                            .execute().actionGet();
//                    log.info("Indexing OK: {} {} {}",
//                            new Object[]{indexResponse.index().toString(), indexResponse.type().toString(), indexResponse.id().toString()});
                } catch (Throwable e) {
                    log.error("Indexing failed: ",e);
                }
            }
            c = threadCounter.decrementAndGet();
            log.info("Batch finished. ({} threads are running)", c);
        }