# ESInstanceDetails


Details about the Amazon OpenSearch Service reservations that AWS recommends that you purchase.

## Contents


 ** CurrentGeneration **   <a name="awscostmanagement-Type-ESInstanceDetails-CurrentGeneration"></a>
Determines whether the recommendation is for a current-generation instance.  
Type: Boolean  
Required: No

 ** InstanceClass **   <a name="awscostmanagement-Type-ESInstanceDetails-InstanceClass"></a>
The class of instance that AWS recommends.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 1024.  
Pattern: `[\S\s]*`   
Required: No

 ** InstanceSize **   <a name="awscostmanagement-Type-ESInstanceDetails-InstanceSize"></a>
The size of instance that AWS recommends.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 1024.  
Pattern: `[\S\s]*`   
Required: No

 ** Region **   <a name="awscostmanagement-Type-ESInstanceDetails-Region"></a>
The AWS Region of the recommended reservation.  
Type: String  
Length Constraints: Minimum length of 0. Maximum length of 1024.  
Pattern: `[\S\s]*`   
Required: No

 ** SizeFlexEligible **   <a name="awscostmanagement-Type-ESInstanceDetails-SizeFlexEligible"></a>
Determines whether the recommended reservation is size flexible.  
Type: Boolean  
Required: No

## See Also


For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/ce-2017-10-25/ESInstanceDetails) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/ce-2017-10-25/ESInstanceDetails) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/ce-2017-10-25/ESInstanceDetails)