[GENERAL] index row requires 10040 bytes, maximum size is 8191

[akp geek]

Hi all -

            I am trying to create an index on character varying field.  The
column is just character varying with no limit. I am getting the following
error " index row requires 10040 bytes, maximum size is 8191"
What can I do the postgres.conf to handle this error? Appreciate your help

Regards