Getting error while following kubernetes deployment document

Error: error setting host sources on target: {"kind":"Unimplemented","message":"Method Not Allowed"}
│
│ with module.boundary.boundary_target.redis,
│ on boundary/targets.tf line 1, in resource "boundary_target" "redis":
│ 1: resource "boundary_target" "redis" {
│
╵
╷
│ Error: error setting host sources on target: {"kind":"Unimplemented","message":"Method Not Allowed"}
│
│ with module.boundary.boundary_target.postgres,
│ on boundary/targets.tf line 14, in resource "boundary_target" "postgres":
│ 14: resource "boundary_target" "postgres" {

Start with the Kubernetes deployment documentation and inspect boundary/targets.tf, especially the boundary_target resources for redis and postgres. Reproduce the deployment to confirm the “Method Not Allowed” error and determine whether host-source configuration is supported; done means both targets deploy without the error.

Written by the indexing model from the issue text.