source.put("content", "Body");
        source.put("cache", "cached data");
        source.put("host", "example.com");

        final Set<String> excludeFields = Set.of("cache");
        final String json = new JsonIndexExportFormatter().format(source, excludeFields);

        assertFalse(json.contains("\"cache\""));
        assertTrue(json.contains("\"host\": \"example.com\""));
    }

- ISO 639-1 language codes: `en`, `ja`, `de`, `fr`, `sv`, etc.
- With region when needed: `pt_BR`, `zh_CN`, `zh_TW`, `en_IE`

### Cache Behavior

- Language items are cached for 1 hour by `SystemHelper`
- Restart the application after adding new languages

### Auto-Generated Files

Never edit these files manually (marked with `@author FreeGen`):
- `FessLabels.java`
- `FessMessages.java`

        // Initialize without container
        emptyGenerator = new EmptyGenerator();

        // Test that isAvailable returns true for EmptyGenerator
        assertTrue(emptyGenerator.isAvailable());
        // Test cached availability
        assertTrue(emptyGenerator.isAvailable());
    }

    @Test
    public void test_isTarget() {
        // Initialize without container
        emptyGenerator = new EmptyGenerator();

        String name = searcher.getName();
        assertNotNull(name);
        assertTrue(name.equals("my_custom") || name.equals("mycustom"));
    }

    /**
     * Test getName() is cached (lazily initialized).
     */
    @Test
    public void test_getNameCached() {
        final TestSearcher searcher = new TestSearcher();
        final String name1 = searcher.getName();

import org.codelibs.fess.Constants;
import org.dbflute.helper.jprop.ObjectiveProperties;
import org.lastaflute.core.direction.PropertyFilter;

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;

public class FessConfigImpl extends FessConfig.SimpleImpl {

    private static final long serialVersionUID = 1L;

    private static class KeyNotFoundException extends Exception {

    }

    /**
     * Creates a path matcher function for path mapping.
     *
     * @param matcher the regex matcher
     * @param replacement the replacement string
     * @return the path matcher function
     */
    public BiFunction<String, Matcher, String> createPathMatcher(final Matcher matcher, final String replacement) { // for PathMapping

    private static final Logger logger = LogManager.getLogger(PopularWordHelper.class);

    /** Character used to separate cache key components */
    protected static final char CACHE_KEY_SPLITTER = '\n';

    /** Cache for storing popular word lists */
    protected Cache<String, List<String>> cache;

    /** Fess configuration instance */
    protected FessConfig fessConfig;

    /**
     * Default constructor.
     */

import org.lastaflute.web.util.LaServletContextUtil;
import org.lastaflute.web.validation.ActionValidator;
import org.opensearch.monitor.os.OsProbe;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import com.ibm.icu.util.ULocale;

import jakarta.annotation.PostConstruct;
import jakarta.annotation.PreDestroy;

/**

	</dd>
	<dt>AND</dt>
	<dd>
		AND operator is the default conjunction operator. You can omit it from
		a query. AND operator matches documents where both terms exist
		anywhere in the text of a single document.
		<pre>Fess AND CodeLibs</pre>
	</dd>
	</dd>
	<dt>OR</dt>
	<dd>
		OR operator matches documents where any terms exist anywhere in the
		text of a single document.
		<pre>Fess OR CodeLibs</pre>
	</dd>
	<dt>Wildcard</dt>

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<artifactId>fess</artifactId>
	<version>15.6.0-SNAPSHOT</version>
	<packaging>war</packaging>
	<name>Fess</name>
	<description>Fess is Full tExt Search System.</description>