Trying to add custom content to search


I am trying to make some content from an API available in Telligent's search results. So I followed the documentation here and I implemented and released locally. I have the Job scheduler running, but my content is not available via Search. 
More specifically I can't see the GetContentToIndex being called at all. Has any of you managed to implement it this ISearchableContentType interface and find the results in Search?

Thank you for your response