What type of decomposers eat an eagle?

Your question contains a misunderstanding. Eagles, like all animals, eventually die and become part of the decomposition process, but they are typically not consumed by a single type of decomposer.

When an eagle dies, it may be scavenged by animals like vultures, foxes, or coyotes. Once the soft tissues have been consumed, the remaining bones and feathers may be broken down by microorganisms and insects such as beetles and mites. This process of decomposition helps to recycle nutrients back into the environment.