I had a similar thing happen on my bike around a year ago. All fine riding along, then no indicators.
Got home, turned the bike off, and on starting it again all was working.
I presume I was a bit ham fisted cancelling a turn signal, and had 'confused' the lighting relay which had become stuck mid position. Turning the power off reset the relay, and then all was fine.
Never happened again after that one time.
Phil