Merge pull request #3238 from ahardin-rh/NFS-storage

Bug 1392058, clarified points around NFS storage

Author: ahardin-rh

install_config/aggregate_logging.adoc

@@ -489,8 +489,9 @@ $ chown 1000:1000 /usr/local/es-storage
 
 Then, use *_/usr/local/es-storage_* as a host-mount as described below.
 Use a different backing file as storage for each Elasticsearch replica.
-Performance under this solution is significantly worse than using actual local
-drives.
+
+This loopback must be maintained manually outside of {product-title}, on the
+node. You must not maintain it from inside a container.
 ====
 
 It is possible to use a local disk volume (if available) on each