Long product descriptions can't be indexed (Postgres)

[coderjib]

Describe the bug
When using postgres, if there is a product with a description field longer than 2704 bytes, this can't be indexed correctly. In this situation, trying to (re)build the search index results in the following error:
ERROR: index row size 2816 exceeds btree version 4 maximum 2704 for index "IDX_9a5a6a556f75c4ac7bfdd03410" - Index row references tuple (0,3) in relation "search_index_item" - Values larger than 1/3 of a buffer page cannot be indexed
The db crashes and the product view in the admin is empty.
The issue is in the SearchIndexItem.description field that has a length limit that is not reflected (for instance) in a length limit in the Admin UI for the description field.

Expected behavior
If this limit can't be increased easily, at least there should be either a limit in the max length of description field in the Admin UI or a message that states that longer descriptions cannot be fully indexed.

Environment (please complete the following information):

• @vendure/core version: 0.18.3
• Database (mysql/postgres etc): Postgres