SuggestUtil.deleteScrollContext(client, scrollId);
                    }
                }
                scrollId = response.getScrollId();
                final SearchHit[] hits = response.getHits().getHits();
                if (scrollId == null || hits.length == 0) {
                    SuggestUtil.deleteScrollContext(client, scrollId);
                    isFinished.set(true);
                }

    }

    @Override
    public long getProgress() {
        return progress;
    }

    @Override
    public long getTotal() {
        return total;
    }

    @Override
    public String getUnit() {
        return unit;
    }

     */
    long getTotal();

    /**
     * The measure used to express the amount of work.
     *
     * @return The measure used to express the amount of work.
     */
    String getUnit();

        this.init = init;
        this.last = last;
    }

    /**
     * @return The initial steps of this chain, or null if this chain only contains one step.
     */
    @Nullable
    public TransformChain getInit() {
        return init;
    }

    /**
     * @return The last step of this chain.
     */
    public TransformStep getLast() {
        return last;
    }

    public boolean requiresDependencies() {