bug: ElastiCache create-replication-group replica will always be created

[rimokuto]

Is there an existing issue for this?

• I have searched the existing issues

Current Behavior

I always create one replica even if I specify replicas-per-node-group 0 in the elasticache create-replication-group command.

Expected Behavior

No slave is created.

How are you starting LocalStack?

With a docker-compose file

Steps To Reproduce

How are you starting localstack (e.g., bin/localstack command, arguments, or docker-compose.yml)

docker-compose.yml

services:
  localstack:
    container_name: "${LOCALSTACK_DOCKER_NAME:-localstack-main}"
    image: localstack/localstack-pro
    ports:
      - "4510-4521:4510-4521"
      - "4566:4566"
    environment:
      - LOCALSTACK_AUTH_TOKEN=${LOCALSTACK_AUTH_TOKEN:-}
      - DOCKER_HOST=unix:///var/run/docker.sock
    volumes:
      - "/var/run/docker.sock:/var/run/docker.sock"
      - "${LOCALSTACK_VOLUME_DIR:-/var/lib/localstack}:/var/lib/localstack"

Client commands (e.g., AWS SDK code snippet, or sequence of "awslocal" commands)

awslocal elasticache create-replication-group \
  --engine redis \
  --replication-group-id my-clustered-redis-replication-group \
  --replication-group-description 'my clustered replication group' \
  --cache-node-type cache.t2.micro \
  --num-node-groups 2 \
  --replicas-per-node-group 0

Environment

- OS: WSL Ubuntu-20.04 on Windows 11
- LocalStack: latest(3.4.0)

Anything else?

No response