diff --git a/services/terraform/modules/shared/opensearch.tf b/services/terraform/modules/shared/opensearch.tf
--- a/services/terraform/modules/shared/opensearch.tf
+++ b/services/terraform/modules/shared/opensearch.tf
@@ -29,7 +29,7 @@
   engine_version = "OpenSearch_1.0"
 
   cluster_config {
-    instance_type = "t3.medium.search"
+    instance_type = "t3.small.search"
   }
 
   vpc_options {