[ENH] Display basic elasticsearch cluster information to help troubleshooting

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@48243 b456876b-0849-0410-b77d-98878d47e9d5
[MRG] Automatic merge, branches/12.x 48212 to 48243

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@48245 b456876b-0849-0410-b77d-98878d47e9d5