New in Terraform: Manage global secondary index drift in Amazon DynamoDB

This article introduces Terraform's new experimental `aws_dynamodb_global_secondary_index` resource for managing DynamoDB GSI drift independently from table configuration.

• New resource treats each GSI as independent with separate lifecycle management
• Enables selective `ignore_changes` for specific GSI attributes, not all-or-nothing
• Solves drift detection issues when capacity adjusted outside Terraform
• Requires environment variable `TF_AWS_EXPERIMENT_dynamodb_global_secondary_index=1`
• Supports granular control: ignore capacity changes while detecting schema modifications
• Full support for warm throughput configuration on on-demand tables
• Migration uses `terraform import` with zero downtime; cannot mix with traditional nested blocks
• Experimental feature; schema may change; test in non-production first

The new resource provides better infrastructure governance by allowing operational capacity adjustments while maintaining drift detection for critical GSI changes like deletions or schema modifications.