Commits on Jul 28, 2021

1. Fix the usage of CacheIteratorHelper for service account (elastic#75510) …

   CacheIteratorHelper requires lock acquisition for any mutation to the
   underlying cache. This means it is incorrect to manipulate the cache
   without invocation of CacheIteratorHelper#acquireUpdateLock. This is OK
   for caches of simple values, but feels excessive for caches of
   ListenableFuture.
   
   This PR update the cache invalidation code to use cache.forEach instead
   of CacheInvalidator. It simplifies the code by removing any explicit
   lockings. The tradeoff is that it needs to build a list of keys to
   delete in memory. Overall it is a better tradeoff since no explicit
   locking is required and better leverage of Cache's own methods.

   

   ywangd authored and elasticsearchmachine committed Jul 28, 2021
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