feat(terraform): add SAML options for ES and OpenSearch domains

Refactored SAML options resources to support both Elasticsearch and OpenSearch
domains. Added conditional logic to create the appropriate resource based on
the selected AWS service type. Updated resource names and configuration to
ensure compatibility and flexibility for both services.

Author: RoseSecurity

src/main.tf

@@ -56,11 +56,23 @@ module "elasticsearch" {
   context = module.this.context
 }
 
-resource "aws_opensearch_domain_saml_options" "this" {
-  count = local.saml_options_enabled ? 1 : 0
+resource "aws_elasticsearch_domain_saml_options" "elasticsearch" {
+  count = local.saml_options_enabled && var.aws_service_type == "elasticsearch" ? 1 : 0
 
   domain_name = module.elasticsearch.domain_name
+  saml_options {
+    enabled = var.elasticsearch_saml_options.enabled
+    idp {
+      entity_id        = var.elasticsearch_saml_options.entity_id
+      metadata_content = var.elasticsearch_saml_options.metadata_content
+    }
+  }
+}
 
+resource "aws_opensearch_domain_saml_options" "opensearch" {
+  count = local.saml_options_enabled && var.aws_service_type == "opensearch" ? 1 : 0
+
+  domain_name = module.elasticsearch.domain_name
   saml_options {
     enabled = var.elasticsearch_saml_options.enabled
     idp {