Reserved Instances in Amazon OpenSearch Service
Reserved Instances (RIs) in Amazon OpenSearch Service offer significant discounts compared to standard On-Demand Instances. The instances themselves are identical; RIs are just a billing discount applied to On-Demand Instances in your account. For long-lived applications with predictable usage, RIs can provide considerable savings over time.
OpenSearch Service RIs require one- or three-year terms and have three payment options that affect the discount rate:
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No Upfront – You pay nothing upfront. You pay a discounted hourly rate for every hour within the term.
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Partial Upfront – You pay a portion of the cost upfront, and you pay a discounted hourly rate for every hour within the term.
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All Upfront – You pay the entirety of the cost upfront. You don't pay an hourly rate for the term.
Generally speaking, a larger upfront payment means a larger discount. You can't cancel Reserved Instances—when you reserve them, you commit to paying for the entire term—and upfront payments are nonrefundable.
RIs are not flexible; they only apply to the exact instance type that you reserve. For
example, a reservation for eight c5.2xlarge.search instances does not apply to
sixteen c5.xlarge.search instances or four c5.4xlarge.search
instances. For full details, see Amazon OpenSearch Service pricing
Examining costs
Cost Explorer is a free tool that you can use to view your spending data for the past 13 months. Analyzing this data helps you identify trends and understand if RIs fit your use case. If you already have RIs, you can group by Purchase Option and show amortized costs to compare that spending to your spending for On-Demand Instances. You can also set usage budgets to make sure you are taking full advantage of your reservations. For more information, see Analyzing Your Costs with Cost Explorer in the AWS Billing User Guide.
