Well,
i have found something interesting.
if I follow the method shared by @el Tio Rufi and does not make any changes in taxonomies then it start working.
If I make any changes like Show/Hide then taxonomies stop working.
Exactly the same problem.
Taxonomies are not displayed in the plug-in.
if follow the link shared by @el Tio Rufi then it shoes the taxonomies but there is no use if it because the search bar is not listing the results from taxonomy.
I have also email you about that but here I see that people are waiting for solution from past 4 months.
looking forward to hear from you soon.