Kyle M Hall authored Mar 06, 2018 and Wm. Nick Clemens committed Jan 25, 2019

The default for Zebra is to not return results where the record size is
greater than 1045 KB ( 1 MB ). Some libraries need to increase this
ceiling, but it may come at a cost with z39.50 compatibility with other
services. For that reason, we should make this setting configurable on a
per-instance basis.

Test plan for kohadevbox:
1) Apply this patch
2) Run:
   $ reset_all
3) Restart Zebra:
   $ sudo koha-zebra --restart kohadev
4) Check how zebrasrv was called:
   $ ps waux | grep zebrasrv
=> SUCCESS: Looks like
 ... /usr/bin/zebrasrv -v none,fatal,warn -k 1024
5) Edit /etc/koha/sites/kohadev/koha-conf.xml, add:
   <zebra_max_record_size>2048</zebra_max_record_size>
6) Repeat (3) and (4)
=> SUCCESS: Looks like
 ... /usr/bin/zebrasrv -v none,fatal,warn -k 2048
7) Sign off :-D

General test plan:
1) Apply this patch
2) Build a Debian package
3) Specify a zebra_max_record_size of 2048 in your koha_conf.xml
4) Restart zebra
5) Index a record greater than 1 MB but smaller than 2 MB
6) Note that it is searchable!

Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
Signed-off-by: Hugo Agud <hagud@orex.es>

Signed-off-by: Nick Clemens <nick@bywatersolutions.com>