diff --git a/README.yaml b/README.yaml
index 12299e8..8c4a37e 100644
--- a/README.yaml
+++ b/README.yaml
@@ -62,7 +62,6 @@ usage : |-
       automatic_failover_enabled  = false
       multi_az_enabled            = false
       num_cache_clusters          = 1
-      replicas_per_node_group     = 1
       retention_in_days           = 0
       snapshot_retention_limit    = 7
 
@@ -112,7 +111,6 @@ usage : |-
       node_type                   = "cache.t2.micro"
       subnet_ids                  = module.subnets.public_subnet_id
       availability_zones          = ["eu-west-1a", "eu-west-1b"]
-      replicas_per_node_group     = 2
       num_cache_nodes             = 1
       snapshot_retention_limit    = 7
       automatic_failover_enabled  = true
diff --git a/_example/memcached/main.tf b/_example/memcached/main.tf
index eb9d138..7ae9ae3 100644
--- a/_example/memcached/main.tf
+++ b/_example/memcached/main.tf
@@ -59,7 +59,6 @@ module "memcached" {
   memcached_route53_record_enabled         = true
   engine                                   = "memcached"
   engine_version                           = "1.6.17"
-  family                                   = "memcached1.5"
   parameter_group_name                     = ""
   az_mode                                  = "cross-az"
   port                                     = 11211
@@ -81,4 +80,4 @@ module "memcached" {
   route53_type                   = "CNAME"
   route53_zone_id                = "SERFxxxx6XCsY9Lxxxxx"
 
-}
\ No newline at end of file
+}
diff --git a/_example/memcached/outputs.tf b/_example/memcached/outputs.tf
index 9842a51..b0bfc3e 100644
--- a/_example/memcached/outputs.tf
+++ b/_example/memcached/outputs.tf
@@ -1,5 +1,5 @@
 output "id" {
-  value       = module.memcached.*.id
+  value       = module.memcached[*].id
   description = "memcached id."
 }
 
@@ -21,4 +21,4 @@ output "hostname" {
 output "redis_ssm_arn" {
   value       = module.memcached.Memcached_ssm_name
   description = "A map of the names and ARNs created"
-}
\ No newline at end of file
+}
diff --git a/_example/redis-cluster/main.tf b/_example/redis-cluster/main.tf
index 6b0d02c..c174e86 100644
--- a/_example/redis-cluster/main.tf
+++ b/_example/redis-cluster/main.tf
@@ -64,7 +64,6 @@ module "redis-cluster" {
   node_type                   = "cache.t2.micro"
   subnet_ids                  = module.subnets.public_subnet_id
   availability_zones          = ["eu-west-1a", "eu-west-1b"]
-  replicas_per_node_group     = 2
   num_cache_nodes             = 1
   snapshot_retention_limit    = 7
   automatic_failover_enabled  = true
diff --git a/_example/redis-cluster/outputs.tf b/_example/redis-cluster/outputs.tf
index 14a5e55..e50332d 100644
--- a/_example/redis-cluster/outputs.tf
+++ b/_example/redis-cluster/outputs.tf
@@ -9,7 +9,7 @@ output "tags" {
 }
 
 output "redis_endpoint" {
-  value       = module.redis-cluster.*.redis_endpoint
+  value       = module.redis-cluster[*].redis_endpoint
   description = "Redis endpoint address."
 }
 
@@ -21,4 +21,4 @@ output "hostname" {
 output "redis_ssm_arn" {
   value       = module.redis-cluster.redis_ssm_name
   description = "A map of the names and ARNs created"
-}
\ No newline at end of file
+}
diff --git a/_example/redis/main.tf b/_example/redis/main.tf
index 3465bba..cbc57ce 100644
--- a/_example/redis/main.tf
+++ b/_example/redis/main.tf
@@ -68,7 +68,6 @@ module "redis" {
   automatic_failover_enabled  = false
   multi_az_enabled            = false
   num_cache_clusters          = 1
-  replicas_per_node_group     = 1
   retention_in_days           = 0
   snapshot_retention_limit    = 7
 
diff --git a/_example/redis/outputs.tf b/_example/redis/outputs.tf
index dd5dde8..83e5716 100644
--- a/_example/redis/outputs.tf
+++ b/_example/redis/outputs.tf
@@ -1,5 +1,5 @@
 output "id" {
-  value       = module.redis.*.id
+  value       = module.redis[*].id
   description = "Redis cluster id."
 }
 
@@ -14,12 +14,12 @@ output "redis_endpoint" {
 }
 
 output "sg_id" {
-  value       = module.redis.*.sg_id
+  value       = module.redis[*].sg_id
   description = "of the security group id."
 }
 
 output "hostname" {
-  value       = module.redis.*.hostname
+  value       = module.redis[*].hostname
   description = "DNS hostname"
 }
 
@@ -27,4 +27,4 @@ output "hostname" {
 output "redis_ssm_arn" {
   value       = module.redis.redis_ssm_name
   description = "A map of the names and ARNs created"
-}
\ No newline at end of file
+}
diff --git a/main.tf b/main.tf
index 00f607b..fa04ec5 100644
--- a/main.tf
+++ b/main.tf
@@ -29,12 +29,6 @@ resource "aws_security_group" "default" {
   }
 }
 
-data "aws_security_group" "existing" {
-  count  = var.is_external ? 1 : 0
-  id     = var.existing_sg_id
-  vpc_id = var.vpc_id
-}
-
 ##----------------------------------------------------------------------------------
 ## Below resources will create SECURITY-GROUP-RULE and its components.
 ##----------------------------------------------------------------------------------
@@ -48,7 +42,7 @@ resource "aws_security_group_rule" "egress" {
   to_port           = 65535
   protocol          = "-1"
   cidr_blocks       = ["0.0.0.0/0"]
-  security_group_id = join("", aws_security_group.default.*.id)
+  security_group_id = join("", aws_security_group.default[*].id)
 }
 #tfsec:ignore:aws-ec2-no-public-egress-sgr
 resource "aws_security_group_rule" "egress_ipv6" {
@@ -60,7 +54,7 @@ resource "aws_security_group_rule" "egress_ipv6" {
   to_port           = 65535
   protocol          = "-1"
   ipv6_cidr_blocks  = ["::/0"]
-  security_group_id = join("", aws_security_group.default.*.id)
+  security_group_id = join("", aws_security_group.default[*].id)
 }
 resource "aws_security_group_rule" "ingress" {
   count = length(var.allowed_ip) > 0 == true && length(var.sg_ids) < 1 ? length(compact(var.allowed_ports)) : 0
@@ -71,7 +65,7 @@ resource "aws_security_group_rule" "ingress" {
   to_port           = element(var.allowed_ports, count.index)
   protocol          = var.protocol
   cidr_blocks       = var.allowed_ip
-  security_group_id = join("", aws_security_group.default.*.id)
+  security_group_id = join("", aws_security_group.default[*].id)
 }
 
 ##----------------------------------------------------------------------------------
@@ -95,7 +89,7 @@ resource "aws_kms_alias" "default" {
   count = var.kms_key_enabled && var.kms_key_id == "" ? 1 : 0
 
   name          = coalesce(var.alias, format("alias/%v", module.labels.id))
-  target_key_id = var.kms_key_id == "" ? join("", aws_kms_key.default.*.id) : var.kms_key_id
+  target_key_id = var.kms_key_id == "" ? join("", aws_kms_key.default[*].id) : var.kms_key_id
 }
 
 ##----------------------------------------------------------------------------------
@@ -113,7 +107,7 @@ data "aws_iam_policy_document" "default" {
       identifiers = [
         format(
           "arn:%s:iam::%s:root",
-          join("", data.aws_partition.current.*.partition),
+          join("", data.aws_partition.current[*].partition),
           data.aws_caller_identity.current.account_id
         )
       ]
@@ -157,8 +151,8 @@ resource "aws_elasticache_replication_group" "cluster" {
   parameter_group_name       = var.parameter_group_name
   node_type                  = var.node_type
   automatic_failover_enabled = var.automatic_failover_enabled
-  subnet_group_name          = join("", aws_elasticache_subnet_group.default.*.name)
-  security_group_ids         = length(var.sg_ids) < 1 ? aws_security_group.default.*.id : var.sg_ids
+  subnet_group_name          = join("", aws_elasticache_subnet_group.default[*].name)
+  security_group_ids         = length(var.sg_ids) < 1 ? aws_security_group.default[*].id : var.sg_ids
   security_group_names       = var.security_group_names
   snapshot_arns              = var.snapshot_arns
   snapshot_name              = var.snapshot_name
@@ -172,7 +166,7 @@ resource "aws_elasticache_replication_group" "cluster" {
   transit_encryption_enabled = var.transit_encryption_enabled
   multi_az_enabled           = var.multi_az_enabled
   auth_token                 = var.auth_token
-  kms_key_id                 = var.kms_key_id == "" ? join("", aws_kms_key.default.*.arn) : var.kms_key_id
+  kms_key_id                 = var.kms_key_id == "" ? join("", aws_kms_key.default[*].arn) : var.kms_key_id
   tags                       = module.labels.tags
   num_cache_clusters         = var.num_cache_clusters
 
@@ -180,7 +174,7 @@ resource "aws_elasticache_replication_group" "cluster" {
     for_each = var.log_delivery_configuration
 
     content {
-      destination      = lookup(log_delivery_configuration.value, "destination", join("", aws_cloudwatch_log_group.default.*.name))
+      destination      = lookup(log_delivery_configuration.value, "destination", join("", aws_cloudwatch_log_group.default[*].name))
       destination_type = lookup(log_delivery_configuration.value, "destination_type", null)
       log_format       = lookup(log_delivery_configuration.value, "log_format", null)
       log_type         = lookup(log_delivery_configuration.value, "log_type", null)
@@ -201,8 +195,8 @@ resource "aws_elasticache_cluster" "default" {
   az_mode                      = var.az_mode
   parameter_group_name         = var.parameter_group_name
   node_type                    = var.node_type
-  subnet_group_name            = join("", aws_elasticache_subnet_group.default.*.name)
-  security_group_ids           = length(var.sg_ids) < 1 ? aws_security_group.default.*.id : var.sg_ids
+  subnet_group_name            = join("", aws_elasticache_subnet_group.default[*].name)
+  security_group_ids           = length(var.sg_ids) < 1 ? aws_security_group.default[*].id : var.sg_ids
   snapshot_arns                = var.snapshot_arns
   snapshot_name                = var.snapshot_name
   notification_topic_arn       = var.notification_topic_arn
@@ -238,7 +232,7 @@ resource "aws_ssm_parameter" "secret" {
   description = var.ssm_parameter_description
   type        = var.ssm_parameter_type
   value       = var.auth_token
-  key_id      = var.kms_key_id == "" ? join("", aws_kms_key.default.*.arn) : var.kms_key_id
+  key_id      = var.kms_key_id == "" ? join("", aws_kms_key.default[*].arn) : var.kms_key_id
 }
 
 ##----------------------------------------------------------------------------------
@@ -251,7 +245,7 @@ resource "aws_ssm_parameter" "secret-endpoint" {
   description = var.ssm_parameter_description
   type        = var.ssm_parameter_type
   value       = var.automatic_failover_enabled ? [join("", aws_elasticache_replication_group.cluster[*].configuration_endpoint_address)][0] : [join("", aws_elasticache_replication_group.cluster[*].primary_endpoint_address)][0]
-  key_id      = var.kms_key_id == "" ? join("", aws_kms_key.default.*.arn) : var.kms_key_id
+  key_id      = var.kms_key_id == "" ? join("", aws_kms_key.default[*].arn) : var.kms_key_id
 }
 
 ##----------------------------------------------------------------------------------
@@ -264,7 +258,7 @@ resource "aws_route53_record" "memcached_route_53" {
   zone_id = var.route53_zone_id
   type    = var.route53_type
   ttl     = var.route53_ttl
-  records = aws_elasticache_cluster.default.*.configuration_endpoint
+  records = aws_elasticache_cluster.default[*].configuration_endpoint
 }
 
 ##----------------------------------------------------------------------------------
@@ -276,6 +270,6 @@ resource "aws_ssm_parameter" "memcached_secret-endpoint" {
   name        = format("/%s/%s/memcached-endpoint", var.environment, var.name)
   description = var.ssm_parameter_description
   type        = var.ssm_parameter_type
-  value       = join("", aws_elasticache_cluster.default.*.configuration_endpoint)
-  key_id      = var.kms_key_id == "" ? join("", aws_kms_key.default.*.arn) : var.kms_key_id
-}
\ No newline at end of file
+  value       = join("", aws_elasticache_cluster.default[*].configuration_endpoint)
+  key_id      = var.kms_key_id == "" ? join("", aws_kms_key.default[*].arn) : var.kms_key_id
+}
diff --git a/outputs.tf b/outputs.tf
index bb91d15..a8b4a59 100644
--- a/outputs.tf
+++ b/outputs.tf
@@ -1,7 +1,7 @@
 # Module      : Redis
 # Description : Terraform module to create Elasticache Cluster and replica for Redis.
 output "id" {
-  value       = var.cluster_enabled ? "" : (var.cluster_replication_enabled ? join("", aws_elasticache_replication_group.cluster.*.id) : join("", aws_elasticache_replication_group.cluster.*.id))
+  value       = var.cluster_enabled ? "" : (var.cluster_replication_enabled ? join("", aws_elasticache_replication_group.cluster[*].id) : join("", aws_elasticache_replication_group.cluster[*].id))
   description = "Redis cluster id."
 }
 
@@ -17,7 +17,7 @@ output "tags" {
 }
 
 output "redis_endpoint" {
-  value       = var.cluster_replication_enabled ? "" : (var.cluster_replication_enabled ? join("", aws_elasticache_replication_group.cluster.*.primary_endpoint_address) : join("", aws_elasticache_cluster.default.*.configuration_endpoint))
+  value       = var.cluster_replication_enabled ? "" : (var.cluster_replication_enabled ? join("", aws_elasticache_replication_group.cluster[*].primary_endpoint_address) : join("", aws_elasticache_cluster.default[*].configuration_endpoint))
   description = "Redis endpoint address."
 }
 
@@ -27,7 +27,7 @@ output "redis_arn" {
 }
 
 output "memcached_endpoint" {
-  value       = var.cluster_enabled ? join("", aws_elasticache_cluster.default.*.configuration_endpoint) : ""
+  value       = var.cluster_enabled ? join("", aws_elasticache_cluster.default[*].configuration_endpoint) : ""
   description = "Memcached endpoint address."
 }
 
@@ -37,25 +37,25 @@ output "memcached_arn" {
 }
 
 output "sg_id" {
-  value = join("", aws_security_group.default.*.id)
+  value = join("", aws_security_group.default[*].id)
 }
 
 output "hostname" {
-  value       = join("", aws_route53_record.elasticache.*.fqdn)
+  value       = join("", aws_route53_record.elasticache[*].fqdn)
   description = "DNS hostname"
 }
 
 output "memcached_hostname" {
-  value       = join("", aws_route53_record.memcached_route_53.*.fqdn)
+  value       = join("", aws_route53_record.memcached_route_53[*].fqdn)
   description = "DNS hostname"
 }
 
 output "redis_ssm_name" {
-  value       = join("", aws_ssm_parameter.secret-endpoint.*.name)
+  value       = join("", aws_ssm_parameter.secret-endpoint[*].name)
   description = "A list of all of the parameter values"
 }
 
 output "Memcached_ssm_name" {
-  value       = join("", aws_ssm_parameter.memcached_secret-endpoint.*.name)
+  value       = join("", aws_ssm_parameter.memcached_secret-endpoint[*].name)
   description = "A list of all of the parameter values"
 }
diff --git a/variables.tf b/variables.tf
index 185950e..591ec78 100644
--- a/variables.tf
+++ b/variables.tf
@@ -29,12 +29,6 @@ variable "label_order" {
   description = "Label order, e.g. `name`,`application`."
 }
 
-variable "attributes" {
-  type        = list(any)
-  default     = []
-  description = "Additional attributes (e.g. `1`)."
-}
-
 variable "extra_tags" {
   type        = map(string)
   default     = {}
@@ -59,13 +53,6 @@ variable "engine" {
   description = "The name of the cache engine to be used for the clusters in this replication group. e.g. redis."
 }
 
-variable "replication_group_id" {
-  type        = string
-  default     = ""
-  description = "The replication group identifier This parameter is stored as a lowercase string."
-  sensitive   = true
-}
-
 variable "automatic_failover_enabled" {
   type        = bool
   default     = true
@@ -92,11 +79,13 @@ variable "node_type" {
 }
 
 variable "security_group_names" {
+  type = list(string)
   default     = null
   description = "A list of cache security group names to associate with this replication group."
 }
 
 variable "snapshot_arns" {
+  type = list(string)
   default     = null
   description = "A single-element string list containing an Amazon Resource Name (ARN) of a Redis RDB snapshot file stored in Amazon S3."
 }
@@ -192,12 +181,6 @@ variable "auth_token" {
   description = "The password used to access a password protected server. Can be specified only if transit_encryption_enabled = true."
 }
 
-variable "family" {
-  type        = string
-  default     = ""
-  description = "(Required) The family of the ElastiCache parameter group."
-}
-
 variable "cluster_replication_enabled" {
   type        = bool
   default     = false
@@ -224,12 +207,6 @@ variable "az_mode" {
   description = "(Memcached only) Specifies whether the nodes in this Memcached node group are created in a single Availability Zone or created across multiple Availability Zones in the cluster's region. Valid values for this parameter are single-az or cross-az, default is single-az. If you want to choose cross-az, num_cache_nodes must be greater than 1."
 }
 
-variable "replicas_per_node_group" {
-  type        = number
-  default     = 2
-  description = "Replicas per Shard."
-}
-
 variable "parameter_group_name" {
   type        = string
   default     = "default.redis5.0"
@@ -432,11 +409,6 @@ variable "route53_zone_id" {
 
 ###------------------------------- ssm_parameter----------------------------
 
-variable "ssm_parameter_enabled" {
-  type        = bool
-  default     = true
-  description = "Name of the parameter."
-}
 variable "ssm_parameter_endpoint_enabled" {
   type        = bool
   default     = false
@@ -460,9 +432,3 @@ variable "ssm_parameter_type" {
   default     = "SecureString"
   description = "Type of the parameter."
 }
-
-variable "ssm_paramete_kms_key_id" {
-  type        = string
-  default     = ""
-  description = "KMS key ID or ARN for encrypting a SecureString."
-}
\ No newline at end of file