When calling LucenePluginApi.getSearchResults when some wiki names in "virtualWikiNames"
parameters, results from all wikis are returned even from wikis not in "virtualWikiNames". The api documentation says : "virtualWikiNames Names of the virtual wikis to search in. May be null for global search.".
The problem is that when making the Lucene query wikis are added with "SHOULD" marker in place of "MUST" marker.