https://github.com/terraform-providers/terraform-provider-aws/pull/1542#issuecomment-350619712

main.tf

resource aws_elasticache_replication_group single {
  node_type                     = "cache.m3.medium"
  number_cache_clusters         = 1
  port                          = 6379
  replication_group_description = "single-test"
  replication_group_id          = "single-test"
  subnet_group_name             = "staging"
}

resource aws_elasticache_replication_group cluster {
  automatic_failover_enabled    = true
  node_type                     = "cache.m3.medium"
  number_cache_clusters         = 2
  port                          = 6379
  replication_group_description = "cluster-test"
  replication_group_id          = "cluster-test"
  subnet_group_name             = "staging"
}

resource aws_elasticache_replication_group native_cluster {
  cluster_mode {
    replicas_per_node_group = 1
    num_node_groups         = 1
  }

  automatic_failover_enabled    = true
  node_type                     = "cache.m3.medium"
  port                          = 6379
  replication_group_description = "native-cluster-test"
  replication_group_id          = "native-cluster-test"
  subnet_group_name             = "staging"
}

resource aws_elasticache_replication_group native_single {
  cluster_mode {
    replicas_per_node_group = 0
    num_node_groups         = 1
  }

  node_type                     = "cache.m3.medium"
  port                          = 6379
  replication_group_description = "native-single-test"
  replication_group_id          = "native-single-test"
  subnet_group_name             = "staging"
}

resource aws_elasticache_replication_group sharding {
  cluster_mode {
    replicas_per_node_group = 0
    num_node_groups         = 2
  }

  automatic_failover_enabled    = true
  node_type                     = "cache.m3.medium"
  port                          = 6379
  replication_group_description = "sharding-test"
  replication_group_id          = "sharding-test"
  subnet_group_name             = "staging"
}

test.bash

#!/usr/bin/env bash
for group in single cluster native_cluster native_single sharding
do
    for attribute in primary_endpoint_address configuration_endpoint_address
    do
        if echo aws_elasticache_replication_group.$group.$attribute | terraform console >/dev/null 2>&1
        then
            result=yes
        else
            result=no
        fi
        printf '%s\t%s\t%s\n' $group $attribute $result
    done
done