[BUGFIX] Fix naming of used facet properties

* changed name -> value
* introduced facet_name

Change-Id: I9aab865a5d70fdbce54894b842d56b83b10f200b
[BUGFIX] Fix a few phpDoc issues

Change-Id: Ifbb1c72e0eb76bedd81a943667db95ae06180b28
[BUGFIX] Use siteHash when cleaning the index

Change-Id: I91f1e0b5c61ef2db3a8a5cc5ae517fe510b2bd48