Add indexing id, specific to ChShaft elements only.
Add indexing id, specific to ChShaft elements only.

andrewseidl/chrono,hsu/chrono,Milad-Rakhsha/chrono,armanpazouki/chrono,dariomangoni/chrono,amelmquist/chrono,projectchrono/chrono,Bryan-Peterson/chrono,Milad-Rakhsha/chrono,dariomangoni/chrono,armanpazouki/chrono,PedroTrujilloV/chrono,Bryan-Peterson/chrono,projectchrono/chrono,rserban/chrono,jcmadsen/chrono,dariomangoni/chrono,PedroTrujilloV/chrono,Milad-Rakhsha/chrono,jcmadsen/chrono,armanpazouki/chrono,projectchrono/chrono,jcmadsen/chrono,amelmquist/chrono,amelmquist/chrono,dariomangoni/chrono,tjolsen/chrono,projectchrono/chrono,armanpazouki/chrono,amelmquist/chrono,dariomangoni/chrono,hsu/chrono,hsu/chrono,Milad-Rakhsha/chrono,hsu/chrono,jcmadsen/chrono,andrewseidl/chrono,dariomangoni/chrono,Bryan-Peterson/chrono,armanpazouki/chrono,Bryan-Peterson/chrono,projectchrono/chrono,PedroTrujilloV/chrono,PedroTrujilloV/chrono,projectchrono/chrono,andrewseidl/chrono,tjolsen/chrono,amelmquist/chrono,rserban/chrono,tjolsen/chrono,rserban/chrono,PedroTrujilloV/chrono,armanpazouki/chrono,andrewseidl/chrono,tjolsen/chrono,amelmquist/chrono,Milad-Rakhsha/chrono,jcmadsen/chrono,rserban/chrono,rserban/chrono,Bryan-Peterson/chrono,tjolsen/chrono,jcmadsen/chrono,rserban/chrono,rserban/chrono,Milad-Rakhsha/chrono,andrewseidl/chrono,hsu/chrono,jcmadsen/chrono