}

    /**
     * Escapes special characters in a value for use in LDAP search filters.
     * This method escapes characters that have special meaning in LDAP filter expressions
     * to prevent LDAP injection attacks.
     *
     * @param value the value to escape (null is treated as empty string)
     * @return the escaped value safe for use in LDAP search filters

        suggester.refresh();

        // Search still sees old data (search alias points to old index)
        assertEquals("Should still see 1 word from old index", 1, suggester.getAllWordsNum());

        // Switch search to new index
        suggester.switchIndex();
        suggester.refresh();

        // Now search sees new data

      offset >= 0 -> offset * 4

      // This section was found by binary search.
      else -> (-offset - 2) * 4 // Not found? Use the preceding element.
    }
  }

  /**
   * Binary search [ranges] for [codePoint], looking at its bottom 7 bits.
   *
   * This binary searches over 4-byte entries, and so it needs to adjust binary search indices
   * in (by dividing by 4) and out (by multiplying by 4).
   */

import org.opensearch.core.xcontent.XContentBuilder;
import org.opensearch.core.xcontent.XContentHelper;
import org.opensearch.search.SearchHit;

/**
 * Utility class for search engine operations and content formatting.
 * Provides helper methods for working with XContent builders, scrolling through search results,
 * and converting XContent objects to different output formats.
 */
public final class SearchEngineUtil {

    protected GeoInfo createGeoInfo(final HttpServletRequest request) {
        return new GeoInfo(request);
    }

    /**
     * The search request type.
     */
    public enum SearchRequestType {
        /** Search request type. */
        SEARCH,
        /** Admin search request type. */
        ADMIN_SEARCH,
        /** JSON request type. */
        JSON,
        /** GSA request type. */
        GSA,

import org.opensearch.search.aggregations.bucket.sampler.SamplerAggregationBuilder;
import org.opensearch.search.aggregations.bucket.terms.SignificantTermsAggregationBuilder;
import org.opensearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.opensearch.search.aggregations.metrics.AvgAggregationBuilder;
import org.opensearch.search.aggregations.metrics.CardinalityAggregationBuilder;

import org.opensearch.search.aggregations.bucket.sampler.SamplerAggregationBuilder;
import org.opensearch.search.aggregations.bucket.terms.SignificantTermsAggregationBuilder;
import org.opensearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.opensearch.search.aggregations.metrics.AvgAggregationBuilder;
import org.opensearch.search.aggregations.metrics.CardinalityAggregationBuilder;

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 {

    /** Logger instance for this class */

    /** Number of records to display per page. */
    private int pageSize;

    /** Current page number being displayed. */
    private int currentPageNumber;

    /** Group ID for search filtering. */
    public String id;

    /** Group name for search filtering. */
    public String name;

    /** Version number for optimistic locking. */
    public String versionNo;

    /**
     * Default constructor for GroupPager.

            resultBuf.append(e.getMessage()).append("\n");
        }

        // purge search logs
        try {
            final int days = ComponentUtil.getFessConfig().getPurgeSearchLogDay();
            if (days >= 0) {
                searchLogService.deleteBefore(days);
            } else {
                resultBuf.append("Skipped to purge search logs.\n");
            }
        } catch (final Exception e) {