Thanks for everyone for the replies. The log growth is happened during index maintenance plan. However, trying to find what particular index is causing the log growth. I load the results in the table. I have list of indexes which were rebuild. But not able to find what particular index is culprit for the growth any idea how to find that? Yes, its full recovery model and t log backups happens every 15 mins. Thanks in advance.
I have to ask, what will you do with the information once you find it? Stop rebuilding it? Probably not. 😉