It is VERY easy for any Arab resident of East Jerusalem to get Israeli citizenship. Ministry of Interior is required to grant them citizenship by law. Tens of thousands of them applied for and received Israeli citizenship. Of course you have to apply while you are still a resident, not when your residency status was revoked after 20 years of absence.
Syrian group says Nusra abducts its leader, in blow to U.S. plan (Reuters)
from the article: The silent expulsion