* Returns true if no errors occurred.
     */
    public boolean success() {
        return errorPoms.isEmpty();
    }

    /**
     * Returns the number of POMs processed.
     */
    public int processedCount() {
        return processedPoms.size();
    }

    /**
     * Returns the number of POMs modified.
     */
    public int modifiedCount() {
        return modifiedPoms.size();
    }

    /**

                    excludeFields, query);
        }

        final long startTime = System.currentTimeMillis();

        try {
            final AtomicLong processedCount = new AtomicLong(0);
            final long count = searchEngineClient.scrollSearch(fessConfig.getIndexDocumentSearchIndex(), requestBuilder -> {
                requestBuilder.setQuery(query).setSize(scrollSize);

                }

                int processedCount = 0;
                for (final String groupId : groupIds) {
                    if (logger.isDebugEnabled()) {
                        logger.debug("[scheduleParentGroupLookup] Processing parent groups for groupId: {} ({}/{})", groupId,
                                ++processedCount, groupIds.size());
                    }

        void shouldCreateEmptyResult() {
            UpgradeResult result = UpgradeResult.empty();

            assertTrue(result.success(), "Empty result should be successful");
            assertEquals(0, result.processedCount(), "Empty result should have no processed POMs");
            assertEquals(0, result.modifiedCount(), "Empty result should have no modified POMs");

 *
 * {@snippet :
 * final String name = ...;
 * inFlight.add(name);
 * ListenableFuture<Result> future = service.query(name);
 * future.addListener(new Runnable() {
 *   public void run() {
 *     processedCount.incrementAndGet();
 *     inFlight.remove(name);
 *     lastProcessed.set(name);
 *     logger.info("Done with {0}", name);
 *   }
 * }, executor);
 * }
 *
 * <h3>How to get an instance</h3>
 *