}
        final RankFusionSearcher[] newSearchers = Arrays.copyOf(searchers, searchers.length + 1);
        newSearchers[newSearchers.length - 1] = searcher;
        searchers = newSearchers;
        synchronized (this) {
            if (executorService == null) {
                int numThreads = ComponentUtil.getFessConfig().getRankFusionThreadsAsInteger();
                if (numThreads <= 0) {

import org.apache.logging.log4j.Logger;

public class IngestFactory {
    private static final Logger logger = LogManager.getLogger(IngestFactory.class);

    private Ingester[] ingesters = {};

    public synchronized void add(final Ingester ingester) {
        if (logger.isDebugEnabled()) {
            logger.debug("Loaded {}", ingester.getClass().getSimpleName());
        }

        }
    }

    protected short getSystemCpuPercent() {
        final long now = getCurrentTimeAsLong();
        if (now - systemCpuCheckTime > systemCpuCheckInterval) {
            synchronized (this) {
                if (now - systemCpuCheckTime > systemCpuCheckInterval) {
                    try {
                        final OsProbe osProbe = OsProbe.getInstance();

        return startProcess(sessionId, cmdList, pbCall, InputStreamThread.MAX_BUFFER_SIZE, null);
    }

    public synchronized JobProcess startProcess(final String sessionId, final List<String> cmdList, final Consumer<ProcessBuilder> pbCall,
            final int bufferSize, final Consumer<String> outputCallback) {

                        doc.remove(thumbnailField);
                    }
                });
            }
            final CrawlingConfigHelper crawlingConfigHelper = ComponentUtil.getCrawlingConfigHelper();
            synchronized (searchEngineClient) {
                final long deletedDocCount = deleteOldDocuments(searchEngineClient, docList);
                if (logger.isDebugEnabled()) {

            if (pattern.matcher(input).matches()) {
                return Constants.FALSE;
            }
        }

        return Constants.TRUE;

    }

    protected synchronized void initDocPathPattern() {
        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();

        if (includedDocPathPatterns == null) {
            if (StringUtil.isNotBlank(getIncludedDocPaths())) {

        refresh();
    }

    public void deleteBadWord(final String badWord) {
        suggester.indexer().deleteBadWord(badWord);
        refresh();
    }

    public synchronized void refresh() {
        suggester.refresh();
        if (popularWordHelper != null) {
            popularWordHelper.clearCache();
        }
    }

    }

    protected void registerModifiedProperty(String propertyName) {
        __modifiedProperties.addPropertyName(propertyName);
        registerSpecifiedProperty(propertyName); // synchronize if exists, basically for user's manual call
    }

    public void modifiedToSpecified() {
        if (__modifiedProperties.isEmpty()) {

    }

    protected void registerModifiedProperty(String propertyName) {
        __modifiedProperties.addPropertyName(propertyName);
        registerSpecifiedProperty(propertyName); // synchronize if exists, basically for user's manual call
    }

    public void modifiedToSpecified() {
        if (__modifiedProperties.isEmpty()) {