[CORE] Remove explicit .cleanUp() on cache clear

Calling cache.cleanUp() is kind of like calling System.gc(), meaning
that we should never have (non-test) things that rely on this
functionality.

For the field data and filter cache, we already have a periodic process
that runs this .cleanUp(), so there is no need to block index
closing/clearing on it. Instead, we can clean the field data cache in
InternalTestCluster before we check the circuit breaker.

This can help tests that time out because cleaning the cache is taking
too long