Bug 35265: Remove drag and drop in Elasticsearch mappings

Bug 35265: Remove drag and drop in Elasticsearch mappings

Bug 18827 says ordering search fields in Elasticsearch mappings is useless.

This patch removes it.
Drag and drop is kept for facets.

Test plan :
1) Enable Elasticsearch
2) Go to Administration > Search engine configuration (Elasticsearch)
3) Go to tab 'Bibliographic records'
4) Check there is no Javscript error
5) Check you can't drag and drop lines anymore

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Barbara Petritsch <barbara.petritsch@wienmuseum.at>
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>