add java opts to bat file as well

bin/plugin.bat

@@ -8,7 +8,7 @@ set SCRIPT_DIR=%~dp0
 for %%I in ("%SCRIPT_DIR%..") do set ES_HOME=%%~dpfI
 
 
-"%JAVA_HOME%\bin\java" -Xmx64m -Xms16m -Des.path.home="%ES_HOME%" -cp "%ES_HOME%/lib/*;" "org.elasticsearch.plugins.PluginManager" %*
+"%JAVA_HOME%\bin\java" %JAVA_OPTS% -Xmx64m -Xms16m -Des.path.home="%ES_HOME%" -cp "%ES_HOME%/lib/*;" "org.elasticsearch.plugins.PluginManager" %*
 goto finally