update plugin name

Author: shi-yuan

src/main/java/org/ansj/elasticsearch/plugin/AnalysisAnsjPlugin.java

@@ -28,7 +28,7 @@
 
 public class AnalysisAnsjPlugin extends Plugin implements AnalysisPlugin, ActionPlugin {
 
-    public static final String PLUGIN_NAME = "analysis-ansj";
+    public static final String PLUGIN_NAME = "elasticsearch-analysis-ansj";
 
     @Override
     public Collection<Module> createGuiceModules() {