Bug 28316: escape exclamation signs in the query

Bug 28316: escape exclamation signs in the query

Currently having exclamation sign at the end of the query makes ES
search fail, and when you try to search for a book that has exclamation
sign in the tittle (something like "Words! words") won't show results
correctly as it tries to negate everything that is after exclamation
sign, making it impossible to search for books that have in in the title

This patch escapes exclamation signs if it's at the end of the query or
has a space after it, resolving both of the issues listed above.

To reproduce:
1) with ES enabled, search for the book with title that contains
exclamation sight at the end, like "book!", this search should result
 in error.
2) do another search, but this time find/prepare beforehand book with a
title that has exclamation sign with a space after it,
e.g "exclamation! sign", it shouldn't find it as ES treats everything
after that exclamation sign as negation.
2) apply the patch.
3) perform searches from the steep one and two again.
Search from step one should no longer fail, while search from the step
two should find that book.

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>