.: May 2016

Download XML File used for this powershell as a input file.
function Start-SearchServices {
[CmdletBinding()]
 param 
 (  
  [Parameter(Mandatory=$true, Position=0)]
  [ValidateNotNullOrEmpty()]
  [string]$SettingsFile
 )

 cls
    Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

 [xml]$settings = Get-Content $SettingsFile
    $config = $settings.config

 #Get the service and crawl Creds for use at the end of the scripts
 $servicecred = Get-Credential -UserName $config.ServiceAccountUser -Message "Search Service Account Password"
 $crawlcred = Get-Credential -UserName $config.CrawlUser -Message "Crawl Account Password"
 

 Write-Host -ForegroundColor Yellow "Checking if Search Application Pool exists" 
    $SPAppPool = Get-SPServiceApplicationPool -Identity $config.SearchAppPoolName -ErrorAction SilentlyContinue

    if (!$SPAppPool) 
    { 
        Write-Host -ForegroundColor Green "Creating Search Application Pool" 
        $spAppPool = New-SPServiceApplicationPool -Name $config.SearchAppPoolName -Account $config.SearchAppPoolAccountName 
    }

 Write-Host "Setting search service properties..."
    while ($true) {
     Get-SPEnterpriseSearchService | Set-SPEnterpriseSearchService `
      -ServiceAccount $servicecred.Username `
      -ServicePassword $servicecred.Password `
      -ContactEmail $svcConfig.ContactEmail `
      -ErrorAction SilentlyContinue -ErrorVariable err
     if ($err) {
            if ($err[0].Exception.Message -like "*update conflict*") { Write-Warning "An update conflict occured"; Start-Sleep 2; continue; }
      throw $err
     }
        break
 }
 
 

    # Start Services search service instance 
    Write-host -ForegroundColor Yellow "Start Search Service instances...." $config.AdminServer
    Start-SPEnterpriseSearchServiceInstance $config.AdminServer -ErrorAction SilentlyContinue 
    Start-SPEnterpriseSearchQueryAndSiteSettingsServiceInstance $config.AdminServer -ErrorAction SilentlyContinue


    Write-Host -ForegroundColor Yellow "Checking if Search Service Application exists" 
    $ServiceApplication = Get-SPEnterpriseSearchServiceApplication -Identity $config.ServiceAppName -ErrorAction SilentlyContinue

    if (!$ServiceApplication) 
    { 
        Write-Host -ForegroundColor Green "Creating Search Service Application" 
        $ServiceApplication = New-SPEnterpriseSearchServiceApplication -Partitioned -Name $config.ServiceAppName -ApplicationPool $spAppPool.Name -DatabaseServer $config.DatabaseServer -DatabaseName $config.DatabaseName 
    }


    Write-Host -ForegroundColor Yellow "Checking if Search Service Application Proxy exists" 
    $Proxy = Get-SPEnterpriseSearchServiceApplicationProxy -Identity $config.SearchServiceProxyName -ErrorAction SilentlyContinue

    if (!$Proxy) 
    { 
        Write-Host -ForegroundColor Green "Creating Search Service Application Proxy" 
        New-SPEnterpriseSearchServiceApplicationProxy -Partitioned -Name $config.SearchServiceProxyName -SearchApplication $ServiceApplication 
    }

   

    $OldTopologyId = $ServiceApplication.ActiveTopology.TopologyId 
    Write-Host -ForegroundColor Green "Active Topology ID: $OldTopologyId"


    # Clone the default Topology (which is empty) and create a new one and then activate it 
    Write-Host -ForegroundColor Yellow "Configuring Search Component Topology...." 
    $clone = $ServiceApplication.ActiveTopology.Clone() 
    $SSI = Get-SPEnterpriseSearchServiceInstance $config.AdminServer 

    if ($SSI.Status -ne "Online")
    {
        $SSI | Start-SPServiceInstance
    }

    # Build out Admin Component
    $admin = $ServiceApplication | Get-SPEnterpriseSearchAdministrationComponent
    $admin | Set-SPEnterpriseSearchAdministrationComponent -SearchServiceInstance $SSI
    $admin = ($ServiceApplication | Get-SPEnterpriseSearchAdministrationComponent)

    while (-not $admin.Initialized)
    {
        Start-Sleep 10
        $admin = ($ServiceApplication | Get-SPEnterpriseSearchAdministrationComponent)
    }

    #
    $adminSearchInstance = Get-SPEnterpriseSearchServiceInstance $config.AdminServer
    $adminComponent = New-SPEnterpriseSearchAdminComponent -SearchTopology $clone -SearchServiceInstance $adminSearchInstance 


    Write-Host -ForegroundColor Cyan "  Create a crawl component"
    $config.CrawlServers.Server | ForEach-Object {
        Write-Host -ForegroundColor Green "  Assigning Crawl Server " $_.Name
        $crawlInstance = Get-SPEnterpriseSearchServiceInstance $_.Name
  
  #Online?
  if ($crawlInstance.Status -ne "Online")
  {
   $crawlInstance | Start-SPServiceInstance | Out-Null
  }
  while ($crawlInstance.Status -ne "Online")
  {
   Start-Sleep 10
   $crawlInstance = Get-SPEnterpriseSearchServiceInstance $_.Name
  }
   
        $crawlComponent = New-SPEnterpriseSearchCrawlComponent -SearchTopology $clone -SearchServiceInstance $crawlInstance | Out-Null
    }


    Write-Host -ForegroundColor Yellow "Create a query processing component"
    $config.QueryServers.Server | ForEach-Object {
        Write-Host -ForegroundColor Cyan "  Assigning Query Server " $_.Name
        $queryInstance = Get-SPEnterpriseSearchServiceInstance $_.Name
  #Online?
  if ($queryInstance.Status -ne "Online")
  {
   $queryInstance | Start-SPServiceInstance | Out-Null
  }
  while ($queryInstance.Status -ne "Online")
  {
   Start-Sleep 10
   $queryInstance = Get-SPEnterpriseSearchServiceInstance $_.Name
  }
 
        $queryComponent = New-SPEnterpriseSearchQueryProcessingComponent -SearchTopology $clone -SearchServiceInstance $queryInstance | Out-Null
    }

  
    Write-Host -ForegroundColor Cyan "  Create an index component. We will use RootDirectory parameter to set the index location."
    #Do you need to create the index directories?
    #Remove-Item -Recurse -Force -LiteralPath $config.IndexLocation -ErrorAction SilentlyContinue 
    #mkdir -Path $config.IndexLocation -Force

    $indexInstance = Get-SPEnterpriseSearchServiceInstance $config.IndexServer
 #Online?
 if ($indexInstance.Status -ne "Online")
 {
  $indexInstance | Start-SPServiceInstance | Out-Null
 }
 while ($indexInstance.Status -ne "Online")
 {
  Start-Sleep 10
  $indexInstance = Get-SPEnterpriseSearchServiceInstance $config.IndexServer
 }
    $indexComponent = New-SPEnterpriseSearchIndexComponent -SearchTopology $clone -SearchServiceInstance $indexInstance -RootDirectory $config.IndexLocation | Out-Null

    Write-Host -ForegroundColor Cyan "  Create an analytics component"
    $analyticsInstance = Get-SPEnterpriseSearchServiceInstance $config.AnalyticsServer
 #Online?
 if ($analyticsInstance.Status -ne "Online")
 {
  $analyticsInstance | Start-SPServiceInstance | Out-Null
 }
 while ($analyticsInstance.Status -ne "Online")
 {
  Start-Sleep 10
  $analyticsInstance = Get-SPEnterpriseSearchServiceInstance $config.AnalyticsServer
 }

    $analyticsComponent = New-SPEnterpriseSearchAnalyticsProcessingComponent -SearchTopology $clone -SearchServiceInstance $analyticsInstance | Out-Null

    Write-Host -ForegroundColor Cyan "  Create a content processing component"
    $contentProcessingInstance = Get-SPEnterpriseSearchServiceInstance $config.ContentProcessingServer
 #Online?
 if ($contentProcessingInstance.Status -ne "Online")
 {
  $contentProcessingInstance | Start-SPServiceInstance | Out-Null
 }
 while ($contentProcessingInstance.Status -ne "Online")
 {
  Start-Sleep 10
  $contentProcessingInstance = Get-SPEnterpriseSearchServiceInstance $config.ContentProcessingServer
 }
    $contentProcessingComponent = New-SPEnterpriseSearchContentProcessingComponent -SearchTopology $clone -SearchServiceInstance $contentProcessingInstance | Out-Null

    #Test the Clone before we activate it.
    if ($clone.ComponentCount -ne 0)
    {
        Write-Host -ForegroundColor Yellow "Activating new topology ..."
        $clone.Activate()
     Write-Host -ForegroundColor Green "New topology activated"
        #Set Default Crawl Account
     Write-Host -ForegroundColor Yellow "Setting default content access account"
        $ServiceApplication | Set-SPEnterpriseSearchServiceApplication -DefaultContentAccessAccountName $crawlcred.UserName -DefaultContentAccessAccountPassword $crawlcred.Password

        #Provide the location of the global Search Center
     Write-Host -ForegroundColor Yellow "Setting default global search center"
        $ServiceApplication = Get-SPEnterpriseSearchServiceApplication
        $ServiceApplication.SearchCenterUrl = $config.SearchCenterUrl
        $ServiceApplication.Update()

        Write-host -ForegroundColor Green "Your search service application $serviceAppName is now ready"

        Write-Host
        Write-Host
     #Optionally remove the old topology here
        $title = "Delete old Topology?"
        $message = "Do you want to delete the old topology?"

        $yes = New-Object System.Management.Automation.Host.ChoiceDescription "&Yes", `
            "Deletes the old topology."

        $no = New-Object System.Management.Automation.Host.ChoiceDescription "&No", `
            "Retains the old topology in an inactive state."

        $options = [System.Management.Automation.Host.ChoiceDescription[]]($yes, $no)

        $result = $host.ui.PromptForChoice($title, $message, $options, 0) 

        if ($result -eq 0)
        {
            Remove-SPEnterpriseSearchTopology -Identity $OldTopologyId -SearchApplication $ServiceApplication
        }
    }
    else
    {
        Write-Host -ForegroundColor Red "Error with Topology, Component Count is 0"
    }

    
 
}

Start-SearchServices -SettingsFile .\searchconfigdht.xml
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