base: global index run during demo site population
base: global index run during demo site population

* Adds missing global indexing process that must be run
  during demo site population.  This is necessary after
  the merge of the virtual index facility from master.

Signed-off-by: Tibor Simko <c7116e45300b163846dc01f3ed02116e3f8ef7a5@cern.ch>

tiborsimko/invenio-base,inveniosoftware/invenio-base,tiborsimko/invenio-base,inveniosoftware/invenio-base