I was attempting to search for something in my development SharePoint farm and couldn’t find it. So I ran the crawler and attempted again. Still couldn’t find it. After poking around, I saw in the error logs that I had 5000+ errors during the search crawl, most of which said something about “the content processing pipeline failed to process the item” and “cannot load wordbreaker for en or the fall back”. I was somewhat confused what the heck had happened since search was working fine a few days ago.
There were some suggestions pointing to a problem of allow multiple values on a managed property when multiple values are really not supported, but that was not the issue in my environment. I remembered that a few days before I had changed the default zone of my web application to use HTTPS instead of HTTP. When I went into the list of site collections to crawl, the site was listed with HTTP. I switched it over to HTTPs and the issue was resolved.