From a99a2d753f1206960554b497934ef4871c9f7944 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pablo=20Torregrosa=20P=C3=A1ez?=
 <20774994+pablotp@users.noreply.github.com>
Date: Mon, 12 May 2025 13:38:53 +0200
Subject: [PATCH 1/2] feat: Allow ignoring GSI changes

---
 main.tf | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/main.tf b/main.tf
index 4302dd5..e55051e 100644
--- a/main.tf
+++ b/main.tf
@@ -70,7 +70,8 @@ resource "aws_dynamodb_table" "default" {
   lifecycle {
     ignore_changes = [
       read_capacity,
-      write_capacity
+      write_capacity,
+      global_secondary_index
     ]
   }
 

From 0d22a4c064d57cf1f006493f57fefc1ce8635189 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pablo=20Torregrosa=20P=C3=A1ez?=
 <20774994+pablotp@users.noreply.github.com>
Date: Mon, 19 May 2025 10:04:44 +0200
Subject: [PATCH 2/2] docs(README): Add a note about the ignored resources

---
 README.md    | 2 +-
 variables.tf | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index be12fd3..5b754e6 100644
--- a/README.md
+++ b/README.md
@@ -239,7 +239,7 @@ See [Terraform types and values](https://www.terraform.io/docs/configuration/exp
 | <a name="input_enable_streams"></a> [enable\_streams](#input\_enable\_streams) | Enable DynamoDB streams | `bool` | `false` | no |
 | <a name="input_enabled"></a> [enabled](#input\_enabled) | Set to false to prevent the module from creating any resources | `bool` | `null` | no |
 | <a name="input_environment"></a> [environment](#input\_environment) | ID element. Usually used for region e.g. 'uw2', 'us-west-2', OR role 'prod', 'staging', 'dev', 'UAT' | `string` | `null` | no |
-| <a name="input_global_secondary_index_map"></a> [global\_secondary\_index\_map](#input\_global\_secondary\_index\_map) | Additional global secondary indexes in the form of a list of mapped values | <pre>list(object({<br/>    hash_key           = string<br/>    name               = string<br/>    non_key_attributes = list(string)<br/>    projection_type    = string<br/>    range_key          = string<br/>    read_capacity      = number<br/>    write_capacity     = number<br/>  }))</pre> | `[]` | no |
+| <a name="input_global_secondary_index_map"></a> [global\_secondary\_index\_map](#input\_global\_secondary\_index\_map) | Additional global secondary indexes in the form of a list of mapped values. <br/>**Note**: Any changes made to the GSIs will be ignored to avoid drift with auto-scaling ([related issue](https://github.com/hashicorp/terraform-provider-aws/issues/671)). | <pre>list(object({<br/>    hash_key           = string<br/>    name               = string<br/>    non_key_attributes = list(string)<br/>    projection_type    = string<br/>    range_key          = string<br/>    read_capacity      = number<br/>    write_capacity     = number<br/>  }))</pre> | `[]` | no |
 | <a name="input_hash_key"></a> [hash\_key](#input\_hash\_key) | DynamoDB table Hash Key | `string` | n/a | yes |
 | <a name="input_hash_key_type"></a> [hash\_key\_type](#input\_hash\_key\_type) | Hash Key type, which must be a scalar type: `S`, `N`, or `B` for (S)tring, (N)umber or (B)inary data | `string` | `"S"` | no |
 | <a name="input_id_length_limit"></a> [id\_length\_limit](#input\_id\_length\_limit) | Limit `id` to this many characters (minimum 6).<br/>Set to `0` for unlimited length.<br/>Set to `null` for keep the existing setting, which defaults to `0`.<br/>Does not affect `id_full`. | `number` | `null` | no |
diff --git a/variables.tf b/variables.tf
index f8a57eb..0200bec 100644
--- a/variables.tf
+++ b/variables.tf
@@ -149,7 +149,7 @@ variable "global_secondary_index_map" {
     write_capacity     = number
   }))
   default     = []
-  description = "Additional global secondary indexes in the form of a list of mapped values"
+  description = "Additional global secondary indexes in the form of a list of mapped values. \n**Note**: Any changes made to the GSIs will be ignored to avoid drift caused by auto-scaling ([related issue](https://github.com/hashicorp/terraform-provider-aws/issues/671))."
 }
 
 variable "local_secondary_index_map" {