What do you mean by "Production"?
I see you are running this on Undertow, so I assume you're running on CapeDwarf, but from the stack trace it looks like the original (Google's) SearchServiceImpl is being used and not CapeDwarf's (which is called CapedwarfSearchService)
Are you bundling appengine-sdk.jar in your war or not? If not, CapeDwarf will use the jar in %CD_HOME%/modules/com/google/appengine/main. Did you run %CD_HOME%/bin/capedwarf-bytecode.sh after installation (or run capedwarf.sh, which automatically also runs capedwarf-bytecode.sh on the first run)?