Postgres ignoring GIN index for LIKE query?
If you want to index for LIKE which are not prefix queries, or for ILIKE queries, then you should look into the pg_trgm extension, giving an index that would look like:

"title_pty_add_15f367_gin" gin (pty_addr gin_trgm_ops)


Also, there have been substantial improvements since 9.4.  You will be doing yourself a favor to upgrade to at least 9.6.