Commits on Mar 26, 2019

1. Enhancements to IndicesQueryCache. (elastic#39099) …

   This commit adds the following:
    - more tests to IndicesServiceCloseTests, one of them found a bug in the order
      in which `IndicesQueryCache#onClose` and
      `IndicesService.indicesRefCount#decRef` are called.
    - made `IndicesQueryCache.stats2` a synchronized map. All writes to it are
      already protected by the lock of the Lucene cache, but the final read from
      an assertion in `IndicesQueryCache#close()` was not so this change should
      avoid any potential visibility issues.
    - human-readable `toString`s to make debugging easier.
   
   Relates elastic#37117

   

   jpountz committed Mar 26, 2019
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