Enable Search for specific sharepoint 2010 list/library using Powershell

$site = New-Object Microsoft.SharePoint.SPSite("yoursiteurl")

$web = $site.openweb("")

$Library = "workingdocuments"

$DocLib = $web.lists[$Library]

Write-Host "title"  $DocLib

Write-Host  "search" $DocLib.NoCrawl

$DocLib.NoCrawl = $false #if it is false search will be enabled

Write-Host  "search enabled:" $DocLib.NoCrawl

$DocLib.update()

$web.dispose()

$site.dispose()