I've just installed the version of WEB-API 2014 and the PI Indexed Search 2014.
I've disabled the Kerberos authentication for the moment on WEB-API but the Search Service fails with the following log:
Source Crawler, Failed to connect to PI Web API at https://MYSERVER/piwebapi/search/. Error System.TypeInitializationException: The type initializer for 'OSIsoft.Search.CrawlerLib.PICrawler' threw an exception. ---> System.DirectoryServices.ActiveDirectory.ActiveDirectoryObjectNotFoundException: The local computer is not joined to a domain or the domain cannot be contacted.