We have a SharePoint 2013 (enterprise) SharePoint farm. I had issues resetting the index and it timed out and I followed this article http://www.thetugboatcomplex.com/?p=1102 and was able to successfully reset the index. After resetting the index I started a full crawl and noticed that search was unable to crawl mysite and searching for people returned empty results. The following was the error. I was able to figure out the issue based on this two articles. SP2013, full crawl error: The content processing pipeline failed to process the item. ( Index was out of range. Must be non and http://www.ericjochens.com/2015/11/sharepoint-search-content-processing.html
There was an issue with "LastName" managed property in search schema which has "Allow Multiple Values" enabled. I unchecked this property and did a full crawl but I still get the error as shown above.
To further troubleshoot this issue I removed the "Last Name" values (in central admin -> user profile) of all the user profiles and did a full crawl again and noticed that errors went away and I was able to search people results. If I add the Last Name back in user profiles I get this error again.
Now my question is, how do I further troubleshoot this issue and figure out exactly how Last Name managed property is causing this issue?
Any Search 'Guru' out there?