Steps to reproduce:
1. Enable search api, database search and taxonomy handler module.
2. Add a Server that uses the Database backend.
3. Create an Index that uses Content as a datasource.
4. Configure the datasourse to use any content type of your choice or say article.
5. Add a taxonomy term reference field in the content type. Let's call this reference field as category.
6. Added title, body and Category as field to be indexed in the field tab in search api config.
7. Now add a aggregated field with title and category field.
8. Change the data type of aggregated field to FullText and increase the boost.
9. Create a view built from the content index.
10. Add fulltext search in exposed filter creteria of the view page.
11. Save the view.
12. Now try searching for any taxonomy term name (from category) in fulltext search.
Ideally it should return all the content which is tagged to this category. But i am not getting any result.
Thanks in advance.
Please let me know if i am not clear enough.