# ScalingParameters
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## Description
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The desired instance type and desired number of replicas of each index partition.

## Contents
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 **DesiredInstanceType**   
The instance type that you want to preconfigure for your domain. For example, `search.medium`.  
Type: String  
Valid Values: `search.small | search.medium | search.large | search.xlarge | search.2xlarge`   
For older domains, valid values might also include `search.m1.small`, `search.m1.large`, `search.m2.xlarge`, `search.m2.2xlarge`, `search.m3.medium`, `search.m3.large`, `search.m3.xlarge`, and `search.m3.2xlarge`.
Required: No 

 **DesiredPartitionCount**   
The number of partitions you want to preconfigure for your domain. Only valid when you select `search.2xlarge` as the instance type.  
Type: Integer  
Required: No 

 **DesiredReplicationCount**   
The number of replicas you want to preconfigure for each index partition.  
Type: Integer  
Required: No