Suggestion on index creation for TEXT data field

Hi Team,
Thanks for your support.
Could you please suggest on below query.

Environment

PostgreSQL: 9.5.15
Postgis: 2.2.7
Mostly table contains GIS data and we are trying to creating an index on
the column which is having an avg width of 149bytes.

CREATE INDEX index_idx
ON SCHEMA.TABLE
USING btree
(column);

ERROR: index row size 2976 exceeds maximum 2712 for index "index_idx"
HINT: Values larger than 1/3 of a buffer page cannot be indexed.
Consider a function index of an MD5 hash of the value, or use full-text
indexing.

Could you please suggest on below queries.
1. How to solve the issue?.
2. What type of index is the best suited for this type of data?.

Thanks for your support.

Regards,
PostgAnn.