Bug 37509: Check Elasticsearch info for both 'about' and 'sysinfo' tabs

Bug 37509: Check Elasticsearch info for both 'about' and 'sysinfo' tabs

1) Notice 'Elasticsearch:' entry at  http://localhost:8081/cgi-bin/koha/about.pl?tab=about is empty
2) Apply patch + restart plack
3) Repeat step 1) Notice it now shows elasticsearch info as expected.
4) Verify that Elasticsearch warning http://localhost:8081/cgi-bin/koha/about.pl?tab=sysinfo is the same before and applying patch.

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>