Support for Custom Full Text Search Dictionaries
PostgreSQL supports so many great full text search capabilities that can be really handy in small to mid sized applications without adding the extra overhead of separate search services.
When self-hosting PG you can add custom dictionaries, with custom synonym, thesaurus, stop word, and other stemming definitions. Currently Azure hosted PostgreSQL doesn't support this, as you'd need access to upload language and dictionary files to use in those definitions. For example, if you want a solid spellchecker via ispell or hunspell you can download those extensions and place them in the $SHAREDIR/tsearch_data directory on the PG server.
Also - this would allow any language to be supported for FTS, which solves many of these other related forum requests for FTS support.