Scale up/down Azure Search Replicaset using Runbooks

Set-AzureSearchReplica.ps1

<#   
.SYNOPSIS   
    Vertically scale (up or down) an Azure SQL Database    
   
.DESCRIPTION   
    This runbook enables one to vertically scale (up or down) Azure Search ReplicaSet using Azure Automation.  
 
 .PARAMETER resourceGroupName
     Name of the Azure Search Resource Group  
       
.PARAMETER serviceName
    Name of Azure Search Service 
 
.PARAMETER replicaCount
    Number of replicas

.NOTES   
    Author: Sachin N    
    Last Updated: 10/10/2016      
#>
    param
    (
        # Name of the Azure Search resource group
        [parameter(Mandatory=$true)] 
        [string] $resourceGroupName,

        # Name of the Azure Search service 
        [parameter(Mandatory=$true)] 
        [string] $serviceName,

        # Desired Replica count
        [parameter(Mandatory=$true)] 
        [int] $replicaCount
    )
    $Conn = Get-AutomationConnection -Name AzureRunAsConnection 
    Add-AzureRMAccount -ServicePrincipal -Tenant $Conn.TenantID `
    -ApplicationId $Conn.ApplicationID -CertificateThumbprint $Conn.CertificateThumbprint
    $resource = Get-AzureRmResource `
        -ResourceType "Microsoft.Search/searchServices" `
        -ResourceGroupName $resourceGroupName `
        -ResourceName $serviceName `
        -ApiVersion 2015-08-19
  $resource.Properties.ReplicaCount = $replicaCount
  $resource | Set-AzureRmResource -Force