SearchFilter gives error in Full-text search using ('@') even when using Django and PostgreSQL

[kushshiv]

Issue :

SearchFilter gives error in Full-text search using ('@').

Documentation :

Documentation link

The search behavior may be restricted by prepending various characters to the search_fields.

'^' Starts-with search.
'=' Exact matches.
'@' Full-text search. (Currently only supported Django's PostgreSQL backend.)
'$' Regex search.

Error:

FieldError("Unsupported lookup 'search' for CharField or join on the field not permitted.")

Using (Django 3.2.4) and (PostgreSQL - 13.1)