protected List<Throwable> failures = Collections.synchronizedList(new ArrayList<>());

    /**
     * Adds a Throwable to the list of failures.
     *
     * @param t the Throwable to add
     */
    public void addFailure(final Throwable t) {
        failures.add(t);
    }

    /**
     * Checks if there are any failures recorded.
     *
     * @return true if there is at least one failure, false otherwise
     */

        Exception exception2 = new RuntimeException("Failure 2");
        Exception exception3 = new IllegalArgumentException("Failure 3");

        result.addFailure(exception1);
        result.addFailure(exception2);
        result.addFailure(exception3);

        assertTrue(result.hasFailure());
        assertEquals(3, result.getFailures().size());
    }

    @Test

        if (response.hasFailures()) {
            for (final BulkItemResponse bulkItemResponses : response.getItems()) {
                if (bulkItemResponses.isFailed()) {
                    result.addFailure(new SuggestIndexException("Bulk failure. " + bulkItemResponses.getFailureMessage()));
                }
            }
        }

        return result;
    }

    @Override