*/
    String getQueryGsaIndexFieldContentType();

    /**
     * Get the value for the key 'query.collapse.max.concurrent.group.results'. <br>
     * The value is, e.g. 4 <br>
     * comment: Maximum concurrent group results for collapse queries.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */

import java.util.Date;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import javax.naming.directory.Attribute;
import javax.naming.directory.BasicAttribute;

import java.time.ZoneId;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.concurrent.atomic.AtomicReference;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import org.codelibs.core.io.FileUtil;
import org.codelibs.core.lang.StringUtil;
import org.codelibs.core.misc.Pair;

    }

    /**
     * Deletes a document from the specified index with optimistic concurrency control.
     *
     * @param index       the index name
     * @param id          the document ID
     * @param seqNo       the sequence number for optimistic concurrency control
     * @param primaryTerm the primary term for optimistic concurrency control
     * @return true if the document was deleted successfully, false otherwise

    /** The key of the message: Delete documents older than specified days */
    public static final String LABELS_DAY_FOR_CLEANUP = "{labels.dayForCleanup}";

    /** The key of the message: Concurrent Crawling Count */
    public static final String LABELS_CRAWLING_THREAD_COUNT = "{labels.crawlingThreadCount}";

    /** The key of the message: Boost */
    public static final String LABELS_BOOST = "{labels.boost}";