Bug 22524: Fix date/time-last-modified search with Elasticsearch

Bug 22524: Fix date/time-last-modified search with Elasticsearch

Avoid using slash in the field name since it would need to be escaped. Fix conversion of dtlm and any existing mapping.

Signed-off-by: Liz Rea <wizzyrea@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
(cherry picked from commit 5d27fb71cbd91fdf196b6568a590f2eef54d7cd1)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit ab0de52ab286dfd2e8585432907d5bf2c36df944)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>