Search PDF Files Not Working

Hi, Latest version of Joomla and DSeller. Im using default template.

Ive Installed both Search plugins and activated, and added some keywords to a test pdf and created a document. The main site search and the DS Module Search does not find the keywords within my simple text PDF?
Have you tested this is working and what else do I need to do to make my latest Joomla search the PDF contents?

Thanks.

Hi, can you help with this please. Your documentation is poor and does not explain how this search is to work?