fix compiler error under elasticsearch 7.15.2

elasticsearch/src/main/java/com/indexea/ideaseg/elasticsearch/IdeasegPlugin.java

@@ -4,7 +4,6 @@ import com.hankcs.hanlp.utility.Predefine;
 import com.indexea.ideaseg.core.IdeasegIOAdapter;
 import com.indexea.ideaseg.core.PluginBase;
 import org.apache.lucene.analysis.Analyzer;
-import org.elasticsearch.common.io.PathUtils;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.env.Environment;
 import org.elasticsearch.index.analysis.AnalyzerProvider;
@@ -35,7 +34,7 @@ public class IdeasegPlugin extends Plugin implements AnalysisPlugin, PluginBase
             home = Environment.PATH_HOME_SETTING.get(settings);
         if (home == null)
             throw new IllegalStateException(Environment.PATH_HOME_SETTING.getKey() + " is not configured");
-        Path pluginHome = PathUtils.get(home, "plugins", PLUGIN_NAME);
+        Path pluginHome = java.nio.file.FileSystems.getDefault().getPath(home, "plugins", PLUGIN_NAME);
         IdeasegIOAdapter.BASE_PATH = pluginHome.toString() + File.separator; //设置 HanLP 根目录
         Predefine.HANLP_PROPERTIES_PATH = IdeasegIOAdapter.BASE_PATH + CONFIG_FILE_NAME;
     }