Denying access to a secondary index

[Sunny Bains]

Hi,

Is it possible to "cleanly" inform MySQL from the engine that an index should
not be used for particular queries ? Currently in handler::index_init() I set
the index to the PRIMARY index, if I don't want a particular transaction to
use a index. While this seems to work, I'm looking/hoping for a better and
cleaner approach.

Regards,
-sunny