如何自定义Lucene whiteSpaceAnalyzer来索引没有特殊字符的单词？

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.Tokenizer;
import org.apache.lucene.analysis.core.LowerCaseFilter;
import org.apache.lucene.analysis.core.WhitespaceTokenizer;
import org.apache.lucene.analysis.util.CharArraySet;

import java.io.Reader;

public class CustomWhiteSpaceAnalyzer extends Analyzer {

    @Override
    protected TokenStreamComponents createComponents(String fieldName, Reader reader) {
        Tokenizer tokenizer = new WhitespaceTokenizer();
        TokenStream tokenStream = new LowerCaseFilter(tokenizer);
        
        // 添加其他的TokenFilter，如停用词过滤、同义词替换等
        
        return new TokenStreamComponents(tokenizer, tokenStream);
    }
}

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.document.Document;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.TextField;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.index.Term;
import org.apache.lucene.queryparser.classic.QueryParser;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.ScoreDoc;
import org.apache.lucene.search.TopDocs;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.RAMDirectory;

public class CustomLuceneExample {

    public static void main(String[] args) throws Exception {
        // 创建自定义的分词器
        Analyzer analyzer = new CustomWhiteSpaceAnalyzer();

        // 创建索引的存储路径
        Directory directory = new RAMDirectory();

        // 创建索引器
        IndexWriterConfig config = new IndexWriterConfig(analyzer);
        IndexWriter indexWriter = new IndexWriter(directory, config);

        // 创建文档
        Document document = new Document();
        document.add(new TextField("content", "This is a sample document", Field.Store.YES));

        // 将文档写入索引
        indexWriter.addDocument(document);

        // 提交索引
        indexWriter.commit();

        // 关闭索引器
        indexWriter.close();

        // 创建搜索器
        IndexSearcher indexSearcher = new IndexSearcher(DirectoryReader.open(directory));

        // 创建查询解析器
        QueryParser queryParser = new QueryParser("content", analyzer);

        // 创建查询
        Query query = queryParser.parse("sample");

        // 使用搜索器进行搜索
        TopDocs topDocs = indexSearcher.search(query, 10);

        // 遍历匹配的文档
        for (ScoreDoc scoreDoc : topDocs.scoreDocs) {
            // 获取文档
            Document resultDoc = indexSearcher.doc(scoreDoc.doc);
            // 获取需要的信息
            String content = resultDoc.get("content");
            System.out.println(content);
        }

        // 关闭搜索器
        indexSearcher.getIndexReader().close();
    }
}