for (int i = 0; i < readerCount; i++) {
            final int index = i;
            readers[i] = new Thread(() -> {
                try {
                    for (int j = 0; j < iterations; j++) {
                        if (dataStore.alive) {
                            trueCount[index]++;
                        } else {
                            falseCount[index]++;
                        }
                    }

/**
 * Callback interface for handling index update operations during data store processing.
 * This interface provides methods for storing documents, tracking processing metrics,
 * and committing changes to the search index.
 */
public interface IndexUpdateCallback {

    /**
     * Stores a document in the search index with the specified parameters and data.
     *

    /** The key of the configuration. e.g. fess_config */
    String INDEX_CONFIG_INDEX = "index.config.index";

    /** The key of the configuration. e.g. fess_user */
    String INDEX_USER_INDEX = "index.user.index";

    /** The key of the configuration. e.g. fess_log */
    String INDEX_LOG_INDEX = "index.log.index";

import org.codelibs.fess.util.ComponentUtil;
import org.opensearch.index.query.QueryBuilder;
import org.opensearch.index.query.QueryBuilders;

/**
 * Job for purging expired documents from the search index.
 * This job removes documents that have passed their expiration time based on the expires field.
 * It helps maintain the search index by cleaning up outdated content automatically.
 */
public class PurgeDocJob {

/**
 * Strategy interface for formatting exported index documents.
 */
public interface IndexExportFormatter {

    /**
     * Returns the file extension for this format (e.g. ".html", ".json").
     *
     * @return the file extension including the leading dot
     */
    String getFileExtension();

    /**
     * Returns the default index file name for this format (e.g. "index.html", "index.json").
     *

import org.opensearch.action.index.IndexAction;
import org.opensearch.action.index.IndexRequestBuilder;
import org.opensearch.action.search.SearchAction;
import org.opensearch.action.search.SearchRequestBuilder;
import org.opensearch.index.query.QueryBuilder;
import org.opensearch.index.query.QueryBuilders;
import org.opensearch.index.query.TermQueryBuilder;
import org.opensearch.index.query.TermsQueryBuilder;

        @Override
        public E get(final int index) {
            return parent.get(index);
        }

        @Override
        public E set(final int index, final E element) {
            return parent.set(index, element);
        }

        @Override
        public void add(final int index, final E element) {
            parent.add(index, element);
        }

        @Override

import org.opensearch.index.query.RangeQueryBuilder;
import org.opensearch.index.query.RegexpQueryBuilder;
import org.opensearch.index.query.SpanTermQueryBuilder;
import org.opensearch.index.query.TermQueryBuilder;
import org.opensearch.index.query.TermsQueryBuilder;
import org.opensearch.index.query.WildcardQueryBuilder;
import org.opensearch.index.query.functionscore.FunctionScoreQueryBuilder;

    /**
     * Scrolls through all documents in the specified index and applies the callback function to each hit.
     *
     * @param index the name of the index to scroll through
     * @param callback the function to apply to each search hit, returning true to continue or false to stop
     * @return the number of documents processed
     */
    public static long scroll(final String index, final Function<SearchHit, Boolean> callback) {

import org.codelibs.fess.unit.UnitFessTestCase;
import org.codelibs.fess.util.ComponentUtil;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.TestInfo;
import org.opensearch.index.query.QueryBuilder;
import org.opensearch.index.query.QueryBuilders;
import org.opensearch.script.Script;
import org.opensearch.script.ScriptType;

public class UpdateLabelJobTest extends UnitFessTestCase {