String field = settings.array().get(SuggestSettings.DefaultKeys.SUPPORTED_FIELDS)[0];

        Map<String, Object> document = new HashMap<>();
        document.put(field, "この柿は美味しい。");
        suggester.indexer().indexFromDocument(new Map[] { document });
        suggester.refresh();

        SuggestResponse response1 = suggester.suggest().setQuery("かき").setSuggestDetail(true).execute().getResponse();
        assertEquals(1, response1.getNum());

        documents[0].put(field, "これはテストです");

        documents[1] = new HashMap<>();
        documents[1].put(field, "検索エンジン");

        SuggestIndexResponse response = suggester.indexer().indexFromDocument(documents);

        assertNotNull(response);
        assertEquals(2, response.getNumberOfInputDocs());
        assertFalse(response.hasError());
    }

    @Test

 * <li>{@link #indexFromQueryLog(QueryLogReader, int, long)} - Index from query log reader with specified document per request and request interval.
 * <li>{@link #indexFromDocument(Map[])} - Index from an array of documents.
 * <li>{@link #indexFromSearchWord(String, String[], String[], String[], int, String[])} - Index from search word.

DocumentReader reader = new ESSourceReader(
    client,
    suggester.settings(),
    "content-index",        // source index
    "document"             // document type
);

suggester.indexer()
    .indexFromDocument(reader, 2, 100)  // threads=2, batch=100
    .getResponse();
```

### Index from Query Logs

```java
import org.codelibs.fess.suggest.index.contents.querylog.QueryLog;

        final int docPerReq = fessConfig.getSuggestUpdateDocPerRequestAsInteger();
        final SystemHelper systemHelper = ComponentUtil.getSystemHelper();
        suggester.indexer().indexFromDocument(() -> {
            final ESSourceReader reader = new ESSourceReader(ComponentUtil.getSearchEngineClient(), suggester.settings(),
                    fessConfig.getIndexDocumentSearchIndex());