如何使用springframework CrudRepository为每次保存操作动态设置Couchbase文档的TTL？

import org.springframework.data.repository.CrudRepository;

public interface CustomRepository<T, ID> extends CrudRepository<T, ID> {
    void saveWithTTL(T entity, int ttl);
}

import com.couchbase.client.java.Bucket;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.couchbase.core.CouchbaseTemplate;
import org.springframework.stereotype.Repository;

@Repository
public class CustomRepositoryImpl<T, ID> implements CustomRepository<T, ID> {

    private final CouchbaseTemplate couchbaseTemplate;

    @Autowired
    public CustomRepositoryImpl(CouchbaseTemplate couchbaseTemplate) {
        this.couchbaseTemplate = couchbaseTemplate;
    }

    @Override
    public void saveWithTTL(T entity, int ttl) {
        Bucket bucket = couchbaseTemplate.getCouchbaseBucket();
        bucket.upsert(couchbaseTemplate.getCouchbaseBucket().name() + "::" + entity.getId(), entity, ttl);
    }
}

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class DocumentService {

    private final CustomRepository<Document, String> customRepository;

    @Autowired
    public DocumentService(CustomRepository<Document, String> customRepository) {
        this.customRepository = customRepository;
    }

    public void saveDocument(Document document, int ttl) {
        customRepository.saveWithTTL(document, ttl);
    }
}