tasks #7149: delete all indexed documents and index new ones for a project

Change-Id: I9cf6e2ae76ac9b6c24c2f1a300c1430f95fc0ccf
Merge commit 'refs/changes/19/2719/11' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  tasks #7149: delete all indexed documents and index new ones for a project

Change-Id: Ic725ded56308fea7b8a3e2f1966674d0033fdc91
Tuleap 7.2.99.23

Change-Id: Iff524d3a77747463ef8430f85f2c003739ee648b