add index on slug in taxonomy table
add index on slug in taxonomy table

nikgo/bolt,lenvanessen/bolt,electrolinux/bolt,romulo1984/bolt,lenvanessen/bolt,cdowdy/bolt,HonzaMikula/masivnipostele,GawainLynch/bolt,bolt/bolt,Intendit/bolt,rarila/bolt,joshuan/bolt,joshuan/bolt,nikgo/bolt,joshuan/bolt,HonzaMikula/masivnipostele,Intendit/bolt,rarila/bolt,GawainLynch/bolt,bolt/bolt,rarila/bolt,cdowdy/bolt,nikgo/bolt,bolt/bolt,cdowdy/bolt,HonzaMikula/masivnipostele,nikgo/bolt,GawainLynch/bolt,romulo1984/bolt,GawainLynch/bolt,electrolinux/bolt,joshuan/bolt,romulo1984/bolt,cdowdy/bolt,rarila/bolt,lenvanessen/bolt,romulo1984/bolt,bolt/bolt,electrolinux/bolt,electrolinux/bolt,HonzaMikula/masivnipostele,Intendit/bolt,lenvanessen/bolt,Intendit/bolt