CostLensOpenSearch Reserved Instance Opportunity
OpenSearch Reserved Instance Opportunity
CostLens surfaces AWS Cost Explorer reserved instance purchase recommendations for steady-state Amazon OpenSearch Service domains.
Updated June 20261 min read
OpenSearch Service reserved instances discount predictable domain capacity versus on-demand. CostLens reads AWS's Cost Explorer recommendation and presents it as a sized, actionable purchase option.
How it works
CostLens queries Cost Explorer
Calls ce:GetReservationPurchaseRecommendation for Amazon OpenSearch Service (runs once — Cost Explorer is global).
Parses each recommendation
Extracts instance class, term, payment option, recommended quantity, estimated monthly savings, and break-even months.
Filters to meaningful spend
Only surfaces recommendations where covered OpenSearch on-demand spend exceeds $200/month.
What to do
- Open the recommendation — the detail view shows term, payment option, break-even months, and annual savings.
- Confirm the domain capacity is steady-state before committing (1- or 3-year term).
- Purchase the reserved instances in the AWS console. This check is advisory.
Required IAM permissions
Read-only — covered by the CostLens ReadOnlyAccess policy from AWS Accounts:
ce:GetReservationPurchaseRecommendation
Limitations
- Advisory only — reserved instance purchases are customer-initiated in the AWS console.
- Defaults to a 1-year, No Upfront recommendation; other terms can be compared in the AWS console.