Bug 25265: (QA follow-up) Check server type in Elasticsearch::index_records

Bug 25265: (QA follow-up) Check server type in Elasticsearch::index_records

Doing the same change as previously (renaming biblionumber), but fixing
at the same the record fetch. If (theoretically) an authority is passed
without a record, it would have fetched a biblio record.

Test plan:
You need Elasticsearch here.
Replaced this line in AddAuthority:
    $indexer->index_records( $authid, "specialUpdate", "authorityserver", $record );
by
    $indexer->index_records( $authid, "specialUpdate", "authorityserver", undef );
And updated an authority record. Check if you can search for the change.

Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
JD amended patch: remove trailing whitespace

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>