@Test
    public void testConcatKinds() {
        // Test static concatKinds method
        SuggestItem.Kind[] kinds1 = { SuggestItem.Kind.QUERY };
        SuggestItem.Kind[] kinds2 = { SuggestItem.Kind.DOCUMENT, SuggestItem.Kind.QUERY };

        SuggestItem.Kind[] result = SuggestItem.concatKinds(kinds1, kinds2);

        assertNotNull(result);
        assertEquals(2, result.length); // Should not have duplicates

        item.kinds = new Kind[kinds.size()];
        for (int i = 0; i < kinds.size(); i++) {
            final String kind = kinds.get(i);
            if (kind.equals(Kind.DOCUMENT.toString())) {
                item.kinds[i] = Kind.DOCUMENT;
            } else if (kind.equals(Kind.QUERY.toString())) {
                item.kinds[i] = Kind.QUERY;
            } else if (kind.equals(Kind.USER.toString())) {

    private boolean matchWordFirst = true;

    private boolean skipDuplicateWords = true;

    /**
     * Sets the index name.
     * @param index The index name.
     */
    public void setIndex(final String index) {
        this.index = index;
    }

    /**
     * Sets the size of results.
     * @param size The size.
     */
    public void setSize(final int size) {

/*
 * Copyright 2012-2025 CodeLibs Project and the Others.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,

import org.codelibs.fess.suggest.entity.ElevateWord;
import org.codelibs.fess.suggest.entity.SuggestItem;
import org.codelibs.fess.suggest.index.SuggestIndexResponse;
import org.codelibs.fess.suggest.index.contents.document.ESSourceReader;
import org.codelibs.fess.suggest.index.contents.querylog.QueryLog;
import org.codelibs.fess.suggest.index.contents.querylog.QueryLogReader;
import org.codelibs.fess.suggest.request.popularwords.PopularWordsResponse;

    }

    /**
     * Creates the analyzer settings index name.
     * @param settingsIndexName The base settings index name.
     * @return The created analyzer settings index name.
     */
    protected String createAnalyzerSettingsIndexName(final String settingsIndexName) {
        return settingsIndexName + "_analyzer";
    }

    /**
     * Loads the index settings from a resource file.

            if (logger.isDebugEnabled()) {
                logger.debug("Failed to create index. index: {}", index, e);
            }
            throw new SuggesterException("Failed to create index.", e);
        }
    }

    /**
     * Creates a new index and replaces the current update alias with the new index.
     */
    public void createNextIndex() {
        try {

    });
```

## Advanced Usage

### Index from Existing Documents

```java
import org.codelibs.fess.suggest.index.contents.document.ESSourceReader;

// Index suggestions from existing Elasticsearch documents
DocumentReader reader = new ESSourceReader(
    client,
    suggester.settings(),
    "content-index",        // source index
    "document"             // document type
);

import org.codelibs.fess.suggest.index.contents.ContentsParser;
import org.codelibs.fess.suggest.index.contents.DefaultContentsParser;
import org.codelibs.fess.suggest.index.contents.document.DocumentReader;
import org.codelibs.fess.suggest.index.contents.querylog.QueryLog;
import org.codelibs.fess.suggest.index.contents.querylog.QueryLogReader;
import org.codelibs.fess.suggest.index.writer.SuggestIndexWriter;

        final Map<String, Object> firstLineInnerMap = new HashMap<>();
        firstLineInnerMap.put("_index", index);
        firstLineInnerMap.put("_type", type);
        firstLineInnerMap.put("_id", item.getId());
        firstLineMap.put("index", firstLineInnerMap);

        final Map<String, Object> secondLine = new HashMap<>();

        secondLine.put("text", item.getText());

        // reading