Examine: Searchindex returns no results despite containing 504 documents

Questions
1 
<add name="PDFIndexer" type="UmbracoExamine.PDF.PDFIndexer, UmbracoExamine.PDF" extensions=".pdf" umbracoFileProperty="File"/>

I got a pdf specific index up and running but no matter what i search for it return " There were no search results.".

I tried rebuilding the index several times to no avail.

My xslt code:

<xsl:variable name="pdfresult" select="Examine:SearchContentOnly($searchTerm,true(),'PDFSearcher')" />
This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/74909-examine-searchindex-returns-no-results-despite-containing-504-documents