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

        return result;
    }

    @Override

import java.util.Collections;
import java.util.List;

public class SuggestWriterResult {
    protected List<Throwable> failures = Collections.synchronizedList(new ArrayList<>());

    public void addFailure(final Throwable t) {
        failures.add(t);
    }

    public boolean hasFailure() {
        return !failures.isEmpty();
    }

    public List<Throwable> getFailures() {
        return failures;
    }