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1. Make sure to set the language as the following screen shot (The class Module is only available starting from Java 9+) 
   
2. Clean & rebuild the project

3. Try invalidating the IntelliJ cache and restarting the IDE, using File > Invalidate caches/ restart

4. Delete the .idea  & .gradle project and rebuild or reimport the project

Can't resolve generated AutoValue classes AutoValue_*:

To fix this issue, you should enable annotation processing in IntelliJ. For that, you will need to go 

File → Settings → Build, Execution, Deployment → Compiler → Annotation Processors

And check "Enable annotation processing" as in the following image.

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After that, you will need to run the build of that specific module. If for example, you want to work on "ElasticsearchIO", you will need to open gradle sidebar, 

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beam → Tasks → sdks → io → elasticsearch

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