How do Module_Index header paths update?

Development Platform & Builds
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1

I have added some header search paths in my Module.Build.cs for linking to some c libraries that I need.

PrivateIncludePaths.AddRange( ... )

Module_Build xcode target builds and runs fine without erros.
However, Module_Index target is throwing errors and I dont’ have any code completion on newly added headers.

Is there a hidden step to get Module_index to use the updated header search paths?
Perhaps regenerating the Module project? I only know how to regenerate the UE project and this doesn’t help.