Multilang text search. Is this correct?

[Florents Tselai]

In my table (mix of text and jsonb columns ) I have text in multiple languages. 
I’d like search in all the possible regconfigs, so I’ve come up with the 
following recipe:

CREATE FUNCTION to_tsvector_multilang(text) RETURNS tsvector AS
$$
SELECT to_tsvector('english', $1) ||
       to_tsvector('greek', $1) ||
       to_tsvector('simple', $1)
$$ LANGUAGE sql IMMUTABLE;

CREATE FUNCTION jsonb_to_tsvector_multilang(jsonb, jsonb) RETURNS tsvector AS
$$
SELECT jsonb_to_tsvector('english', $1, $2) ||
       jsonb_to_tsvector('simple', $1, $2) ||
       jsonb_to_tsvector('greek', $1, $2)
$$ LANGUAGE sql IMMUTABLE;

CREATE FUNCTION to_tsquery_multilang(query text) RETURNS tsquery AS
$$
SELECT websearch_to_tsquery('english', query) ||
       websearch_to_tsquery('simple', query) ||
       websearch_to_tsquery('greek', query)
$$ LANGUAGE sql IMMUTABLE;
Thus, in searching I use  to_tsvector_multilang(’TEXT') @@ 
to_tsquery_multilang(‘QUERY’);
Looks like it’s working as expected from my prelim tests, but anyone seeing any 
potential pitfalls? 

Note: I’m using GIN & RUM indices as well.