Force Spotlight to index specific Library folders

How can I get Spotlight to index a directory in the system's Library folder? I'm trying to get Spotlight running 10.10.3 to index some folders in the Macintosh HD/Library folder. I'm not getting any search results from these folders so it appears Spotlight is not searching/indexing them. The folder can be found at: Macintosh HD/Library/FileMaker Server/HTTPServer/htdocs/ I am getting search results for other Library folders, such as my web root folder at: /Library/WebServer/Documents/ Is there a way to force Spotlight to also index the Library/FileMaker Server/HTTPServer/htdocs folder as well? (I want to index FileMaker Server's web root folder that I referenced above. I will not be indexing the FileMaker Server database folders as I have excluded those from Spotlight)