tasks #7229 Deal with date values

This task is part of story #7028 Search in wiki pages

The date stored in elasticsearch for phpwiki pages is stored like dates for docman items

Change-Id: I039997d883102db213de6edd3187c0bc12e7eb1a
Merge commit 'refs/changes/85/2785/1' of ssh://gerrit.tuleap.net:29418/tuleap into HEAD

* ssh://gerrit.tuleap.net:29418/tuleap:
  tasks #7229 Deal with date values

Change-Id: Id9df8be9d2b02a1e330d8e912441e74e4058849a
This is Tuleap 7.2.99.60

Change-Id: Ib14a35a0afbcd4be85b4e973c55b201e08177fb1