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There is a KB for troubleshoot the PI Web API Index search crawler
KB01401 - Common solutions for PI Web API Indexed Search not crawling
When you do reboot the machine, do you know that the service was started correctly?
Sometimes, PI Web API Search crawler have problem to start the service. I think this service startup type = Automatic (delayed start) by default.
If you restart the service works after rebooting machine, then the other possibility is that you can try to set recovery option.
Go to services.msc and right click the pi web api search crawler service > property
If the service startup was not root cause of the issue, then please check event logs for more troubleshoot.