Bug 12478: Fix error on indexing a specific record

Bug 12478: Fix error on indexing a specific record

% perl misc/search_tools/rebuild_elastic_search.pl -bn 42
Can't locate object method "idnumber" via package "MARC::Record" at
misc/search_tools/rebuild_elastic_search.pl line 171.

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Jesse Weaver <jweaver@bywatersolutions.com>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Brendan Gallagher <brendan@bywatersolutions.com>