Windows 10 Search in Network Shares
Copernic Desktop Search
X1 Search
https://social.technet.microsoft.com/Forums/windowsserver/en-US/b41a3f55-8d5e-4adb-9ec9-b659904762c9/windows-10-search-indexing-network-share
https://winaero.com/blog/how-to-search-network-shares-or-mapped-drives-in-windows-10/