tasks #7261: Process wiki reindex event

This task is part of story #7185 Search in existing wiki pages

Change-Id: I17f061160526c26140b083e0599d45b0119eb18e
Merge commit 'refs/changes/01/2801/2' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  tasks #7261: Process wiki reindex event

Change-Id: I15a10b00835c330bffbb6731dad191b685dd8beb
Tuleap 7.3.99.4

Change-Id: I1c1a1e2fbbb541da17170fb203e75aa704423afb