Bug 28316: escape brackets in the search query

Bug 28316: escape brackets in the search query

This patch screens square and curly brackets which have no special
language meaning.

To reproduce:
1) using ES, search for the book with title that contains
square and/or curly brackets, like "book [second edition]", which will
result in error.
2) apply the patch.
3) search for that book again, ensure that it works now.

Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Alex Buckley <alexbuckley@catalyst.net.nz>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>