See bug 31144 and http://git.koha-community.org/gitweb/?p=koha.git;a=commit;h=6ae7b60962e7d07aa00a45a7af692939a4ce7aa6. A system preference GoogleIndicTransliteration should be added to expose this feature and document it. Currently the feature will work if you add the pref locally and set it to 1.
*** This bug has been marked as a duplicate of bug 13211 ***