创建嵌入式Elasticsearch引擎时出错

Question

我编写了以下代码来创建嵌入式Elasticsearch引擎：

public class EmbeddedElasticsearchServer {

  private static final String DEFAULT_DATA_DIRECTORY = "/Users/kevin/elasticsearch-5.2.2/data";
  private static final String DEFAULT_PATH_DIRECTORY = "/Users/kevin/elasticsearch-5.2.2/home/dir";
  private final Node node;
  private final String dataDirectory;
  public EmbeddedElasticsearchServer() {
    this(DEFAULT_DATA_DIRECTORY);
  }
  public EmbeddedElasticsearchServer(String dataDirectory) {
    this.dataDirectory = dataDirectory;
    MudrodEngine mudrodEngine = new MudrodEngine();
    Settings.Builder elasticsearchSettings = Settings.builder().put("http.enabled", "false").put("path.data", dataDirectory).put("path.home", DEFAULT_PATH_DIRECTORY);
    node = new Node(elasticsearchSettings.build());
  }
  public Client getClient() {
    return node.client();
  }
  public void shutdown() {
    try {
      node.close();
    } catch (IOException e) {
      System.out.println(e);
    }
    deleteDataDirectory();
  }
  private void deleteDataDirectory() {
    try {
      FileUtils.deleteDirectory(new File(dataDirectory));
    } catch (IOException e) {
      throw new RuntimeException("Could not delete data directory of embedded elasticsearch server", e);
    }
  }
}

但是，当使用此功能进行单元测试时，它无法通过，错误如下：

java.lang.IllegalStateException：无法获取节点锁，尝试使用lock id [0] [[/ Users/kevin/elasticsearch-5.2.2/data/elasticsearch]];也许这些位置不可写或多个节点在没有增加[node.max_local_storage_nodes]的情况下启动（是[1]）？

有任何帮助吗？谢谢大家。