Bug 28339: Elasticsearch - Add 8XX to default title-series index mappings (MARC21)

Bug 28339: Elasticsearch - Add 8XX to default title-series index mappings (MARC21)

This patch adds series added entries titles (800 $t, 810 $t, 811 $t, and 830 $a) in the
default title-series index mappings.

To test:

1) Apply patch
2) Reindex using rebuildelasticsearch.pl -r

If you don't have access to a terminal (in a sandbox for example)
2a) Go to Administration > Search engine configuration and click "Reset mappings" and confirm
2b) Then reindex

3) Search for a series title found only in and added entry field

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>