Service.Instance Scoped executors has no thread pool size limit

[zalenski]

instance.getExecutorService() uses Executors.newCachedThreadPool which has no thread pool size limit

see http://stackoverflow.com/questions/1800317/impossible-to-make-a-cached-thread-pool-with-a-size-limit

[zalenski]

Maybe it could just be removed, it's not used much.

[pettermahlen]

I would actually be in favour of removing this for 2.0 - I don't see that providing shared executor services is a good fit for the core of Apollo. It's something that can easily be done at the application level. @rouzwawi ?

[mattnworb]

+1 for removal