I don't think that's an appropriate term for Singapore, at least. The FDW can resign at any time (whether their contract is finished or not), in which case the employer is obligated to return them to their home city. There is a mandated 1 rest day per week. (note for Westerners accustomed to a 2-day weekend: this is identical to working-class Singaporeans.) The legal system can and does prosecute cases of abuse against FDWs.

Generally speaking FDWs are pleased to have the opportunity to work in Singapore as it is 2-3 times what they could earn at home, but they do hope for a "kindly" employer.

Other countries do not have such a good reputation. Philippines actually banned Saudi Arabia from hiring domestic OFWs because of cases of indentured servitude, abuse and murder.

It's much worse in neighboring countries like Malaysia. There maids are usually not allowed to leave the house unaccompanied because of the strict immigration laws that would punish heavily the family if the maid ran away.

Between that and the poor living conditions, it's indentured servitude for the time of their contracts. Absolutely awful.

HK is doing much better and has stronger laws to protect domestic workers (actual day off, etc...), Singapore is catching up but in other countries it's extremely sad.