@Override
    public String toString() {
        return "BulkResponse{"
                + "bulkSuccessfulResults="
                + bulkSuccessfulResults
                + ", bulkErrorResults="
                + bulkErrorResults
                + ", message='"
                + message
                + '\''
                + '}';
    }
Key - entityId Value - error message processing this entity
common/src/main/java/com/netflix/conductor/common/model/BulkResponse.java