Please DO NOT PROCEED with the decommission yet until replacement is completely setup
es2001,2,3,4 were old hosts which were replaced by es201* hosts. However, due to the lack of space elsewhere, it was requested to keep them for external store backups of non-read only hosts, and later, for backup target of metadata and misc databases.
The later was substituted by dbprov* hosts, while the first will be substituted by the new bacula shelves, which are in process of being setup.
Once that happens, these 4 hosts will be ready for decommission.