FAST Synonym Hit Highlighting

I recently worked on a FAST Search implementation and found a couple of gotcha’s that I wanted to note. 

First, FAST search does not do hit highlighting when you match against  a defined synonym.  So if your content has the word “CAR” and you define a synonym of “Auto” for “CAR”.  Then when you search for Auto you will also get search results for everything that has CAR.   Works great, except that the Search results displayed don’t hit highlight CAR.    Definitely a shortcoming and was reported to Microsoft as an enhancement.  Will need to keep an eye on this to see where it goes. 

When I get my development FAST environment running, I will reproduce and add some screen shots.