terraform plan

  # module.instance.openstack_compute_instance_v2.server[0] will be updated in-place
  ~ resource "openstack_compute_instance_v2" "server" {
        access_ip_v4        = "IP"
        all_metadata        = {}
        all_tags            = []
        availability_zone   = "nova"
        flavor_id           = "4335773d-64ae-4c54-b0e4-4cb26b7dda75"
      ~ flavor_name         = "FLAVOR_1" -> "FLAVOR_2"
        force_delete        = false
        id                  = "8b2c680a-183c-49ce-b3bc-ca43a6201e33"
        image_id            = "Attempt to boot from volume - no image supplied"
        name                = "instance-1"
        power_state         = "active"
        security_groups     = [
            "ALLOW_ALL",
            "default",
        ]
        stop_before_destroy = false
        tags                = []
        user_data           = "x"

        block_device {
            boot_index            = 0
            delete_on_termination = true
            destination_type      = "volume"
            source_type           = "volume"
            uuid                  = "a77d2c36-5c8b-418d-8c53-9deac1e9a800"
            volume_size           = 0
        }

        network {
            access_network = false
            fixed_ip_v4    = "IP"
            mac            = "fa:16:3e:93:50:1d"
            name           = "vlan"
            uuid           = "b2976616-08ee-47c1-9918-b9bb23777a50"
        }

        scheduler_hints {
            additional_properties = {}
            different_host        = []
            group                 = "30ae35ba-e01f-4024-b3ac-da1637dae6b0"
            query                 = []
            same_host             = []
        }
    }

  # module.instance.openstack_compute_instance_v2.server[1] will be updated in-place
  ~ resource "openstack_compute_instance_v2" "server" {
        access_ip_v4        = "IP"
        all_metadata        = {}
        all_tags            = []
        availability_zone   = "nova"
        flavor_id           = "4335773d-64ae-4c54-b0e4-4cb26b7dda75"
      ~ flavor_name         = "FLAVOR_1" -> "FLAVOR_2"
        force_delete        = false
        id                  = "bc6006b3-8663-4006-b01f-402ad96fdfbd"
        image_id            = "Attempt to boot from volume - no image supplied"
        name                = "instance-2"
        power_state         = "active"
        security_groups     = [
            "ALLOW_ALL",
            "default",
        ]
        stop_before_destroy = false
        tags                = []
        user_data           = "x"

        block_device {
            boot_index            = 0
            delete_on_termination = true
            destination_type      = "volume"
            source_type           = "volume"
            uuid                  = "27b06e8b-3590-4bf3-a9f8-13c09ca522e4"
            volume_size           = 0
        }

        network {
            access_network = false
            fixed_ip_v4    = "IP"
            mac            = "fa:16:3e:7d:e1:32"
            name           = "vlan"
            uuid           = "b2976616-08ee-47c1-9918-b9bb23777a50"
        }

        scheduler_hints {
            additional_properties = {}
            different_host        = []
            group                 = "30ae35ba-e01f-4024-b3ac-da1637dae6b0"
            query                 = []
            same_host             = []
        }
    }

Plan: 0 to add, 2 to change, 0 to destroy.