>>11371721
Yes.
First of all, indentured slaves are protected by their contract. The contract stipulates certain protections for the slave, which almost always contain protections against killing or maiming a slave.
The indentures have little to no actual negotiating power, but their one form of protection is the fact that an organization that didn't contain protections against killing and maiming would be unable to secure a supply of contracts, and that an organization that violated contracts would also soon run out of business. Usually the contracts are respected. Contracts almost always stipulate that punishments such as corporal punishment and indefinite imprisonment are permitted, and imprisoned slaves are granted less progress toward fulfilling their contracts if they were imprisoned with cause.
For permanent slaves (an indenture whose contract exceeds 50 years is automatically considered to have a life sentence and their contract is immediately void), there are far fewer protections. Generally, slaves have no access to the legal system, and may not bring cases before a court or testify in court in any capacity (if defending, they must stand trial gagged and restrained).
It is not legal to kill your own slave, but the punishment for doing so is a fine, not a murder charge. Killing someone else's slave would land you in prison, and likely enslaved yourself.