PowerShell to Search SharePoint and Export Results to CSV using Keyword Query

Requirement: Search SharePoint site and export the search results to CSV file using PowerShell.

PowerShell to Export SharePoint Search Results to CSV:
Here is the PowerShell to search all documents in a SharePoint Online site collection and export search results to CSV. 

Add-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction SilentlyContinue

#Set Parameters
$SiteURL = "http://intranet.crescent.com/"
$CSVFile = "C:\Temp\SearchResults.csv"

#Get the site collection
$Site = Get-SPSite $SiteURL

#Frame Query to search: Get all documents sorted by Last modified
$keywordQuery = New-Object Microsoft.Office.Server.Search.Query.KeywordQuery($Site)
$SearchQuery = "site:http://intranet.crescent.com ContentType:document NOT FileExtension:aspx"
$keywordQuery.QueryText = $SearchQuery
$keywordQuery.SortList.Add("LastModifiedTime","Asc")

#Execute Search
$SearchExecutor = New-Object Microsoft.Office.Server.Search.Query.SearchExecutor
$searchResults = $SearchExecutor.ExecuteQuery($keywordQuery)

#Get Search Results
$Table = $SearchResults.Table
$Table | select Title, Path, Author, LastModifiedTime

#Export Search results to Excel
$Table | Export-Csv $CSVFile -NoTypeInformation

Write-Host -f Green "Search Results Exported to CSV File!"

and the result CSV:

Here is how to search SharePoint Online using Keyword query: PowerShell to Search SharePoint Online Site using Keyword Query