You could disable them which drops all of the data from the index but keeps the meta data and see if peformance suffers. Of course, you need to do a test on whatever is using the indexes before you do that. If performance does suffer, rebuild the index and it will reform, data and all.

Of course, there are the normal warnings about doing this on high usage or large tables during business hours and that such action could cause some substantial logfile growth like any index reorg (no matter the recovery model) or index rebuild (in the FULL recovery model) can cause.