assertEquals("{constraints.NotBlank.message}", FessMessages.CONSTRAINTS_NotBlank_MESSAGE);
        assertEquals("{constraints.NotEmpty.message}", FessMessages.CONSTRAINTS_NotEmpty_MESSAGE);
        assertEquals("{constraints.Range.message}", FessMessages.CONSTRAINTS_Range_MESSAGE);
        assertEquals("{constraints.SafeHtml.message}", FessMessages.CONSTRAINTS_SafeHtml_MESSAGE);

import org.opensearch.search.aggregations.bucket.missing.MissingAggregationBuilder;
import org.opensearch.search.aggregations.bucket.range.DateRangeAggregationBuilder;
import org.opensearch.search.aggregations.bucket.range.IpRangeAggregationBuilder;
import org.opensearch.search.aggregations.bucket.range.RangeAggregationBuilder;
import org.opensearch.search.aggregations.bucket.sampler.SamplerAggregationBuilder;

import org.opensearch.search.aggregations.bucket.missing.MissingAggregationBuilder;
import org.opensearch.search.aggregations.bucket.range.IpRangeAggregationBuilder;
import org.opensearch.search.aggregations.bucket.range.RangeAggregationBuilder;
import org.opensearch.search.aggregations.bucket.sampler.SamplerAggregationBuilder;

import org.opensearch.search.aggregations.bucket.missing.MissingAggregationBuilder;
import org.opensearch.search.aggregations.bucket.range.IpRangeAggregationBuilder;
import org.opensearch.search.aggregations.bucket.range.RangeAggregationBuilder;
import org.opensearch.search.aggregations.bucket.sampler.SamplerAggregationBuilder;

constraints.NotBlank.message = {item}는 필수 항목입니다.
constraints.NotEmpty.message = {item}는 필수 항목입니다.
constraints.ParametersScriptAssert.message = 스크립트 표현식 "{script}"가 true가 아닙니다.
constraints.Range.message = {item}는 {min}에서 {max} 사이여야 합니다.
constraints.SafeHtml.message = {item}에 안전하지 않은 HTML 콘텐츠가 포함되어 있습니다.
constraints.ScriptAssert.message = 스크립트 표현식 "{script}"가 true가 아닙니다.
constraints.URL.message = {item}는 유효한 URL이 아닙니다.

import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;

/**
 * Helper class for managing Fess plugins and artifacts.
 * This class provides functionality to discover, install, and manage various types of plugins
 * including data stores, themes, ingest processors, scripts, web applications, thumbnails, and crawlers.
 */
public class PluginHelper {
    /** Logger instance for this class */

     */
    public void addDocBoostMatcher(final DocBoostMatcher rule) {
        docBoostMatcherList.add(rule);
    }

    /**
     * Sets the list of crawler instances that this updater will manage.
     *
     * @param crawlerList the list of crawlers to set
     */
    public void setCrawlerList(final List<Crawler> crawlerList) {
        this.crawlerList = crawlerList;
    }

constraints.NotBlank.message = {item} は未入力です。
constraints.NotEmpty.message = {item} は未入力です。
constraints.ParametersScriptAssert.message = スクリプト式「{script}」がtrueではありません。
constraints.Range.message = {item} は {min} から {max} の範囲にある必要があります。
constraints.SafeHtml.message = {item} は危険な HTML コンテンツを含んでいます。
constraints.ScriptAssert.message = スクリプト式「{script}」がtrueではありません。
constraints.URL.message = {item} は有効なURLではありません。

    public static final Pattern LUCENE_FIELD_RESERVED_PATTERN = Pattern.compile("([+\\-!\\(\\){}\\[\\]^\"~\\\\:\\p{Zs}]|(&&)|(\\|\\|))"); // "*", "?",

    /** Pattern for detecting reserved characters in Lucene range field queries. */
    public static final Pattern LUCENE_RANGE_FIELD_RESERVED_PATTERN = Pattern.compile("([!\\(\\){}\\[\\]\"~\\\\:\\p{Zs}]|(&&)|(\\|\\|))");

    // ============================================================

        final Map<String, Object> map = Map.of( //
                "query", Map.of("bool", Map.of("must", List.of( //
                        Map.of("term", Map.of("type", "heartbeat")), //
                        Map.of("range", Map.of("expiredTime", Map.of("gte", 1000L)))))));

        final String json = coordinatorHelper.toJson(map);
        assertNotNull(json);
        assertTrue(json.contains("\"must\""));