Abdullah, his son Omar Abdullah and several other top Kashmiri politicians were among thousands taken into custody following the clampdown in occupied Kashmir.
The Abdullahs and other politicians were detained under the stringent Public Safety Act, that has been condemned by rights groups because suspects can be held for up to two years without appearing in court.
A police report justifying the detention accused the veteran lawmaker of resorting to "dirty politics" and "instigating and provoking general masses" against the Indian government. Omar Abdullah, also a former chief minister, and hundreds of others remain in detention, many outside the territory in other Indian states.