Adding Relaxed Astar Global Path Planner As Plugin in ROS Indigo

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I have followed this Adding Relaxed Astar Global Path Planner As Plugin in ROS tutorials. There is no error in catkin make, I have successfully built the relaxed_astar_lib package but, in the tutorial, when I try to querying ROS package using command rospack plugin --attrib=plugin nav_core it is not available.

abc@abc:~/catkin_ws$ rospack plugins --attrib=plugin nav_core
navfn /opt/ros/indigo/share/navfn/bgp_plugin.xml
move_slow_and_clear /opt/ros/indigo/share/move_slow_and_clear/recovery_plugin.xml
rotate_recovery /opt/ros/indigo/share/rotate_recovery/rotate_plugin.xml
global_planner /opt/ros/indigo/share/global_planner/bgp_plugin.xml
dwa_local_planner /opt/ros/indigo/share/dwa_local_planner/blp_plugin.xml
clear_costmap_recovery /opt/ros/indigo/share/clear_costmap_recovery/ccr_plugin.xml
base_local_planner /opt/ros/indigo/share/base_local_planner/blp_plugin.xml
carrot_planner /opt/ros/indigo/share/carrot_planner/bgp_plugin.xml

It is not added here. Whats the problem?

Thank you.