WITH columns AS (SELECT nspname AS table_schema, relname AS table_name, 
CASE WHEN relkind='r' THEN 'BASE TABLE'
WHEN relkind='m' THEN 'MATERIALIZED VIEW'
END AS table_type, 
attname AS column_name,
coalesce(domain_type.typname, pg_type.typname) AS data_type
FROM pg_class INNER JOIN pg_namespace ON pg_class.relnamespace=pg_namespace.oid
INNER JOIN pg_attribute ON pg_class.oid=pg_attribute.attrelid
INNER JOIN pg_type ON pg_attribute.atttypid =pg_type.oid
LEFT JOIN pg_type AS domain_type ON domain_type.oid=pg_type.typbasetype
WHERE attnum>=1 
AND relkind IN ('r','m')
AND nspname NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL)),
text_search_cols AS (SELECT table_schema, table_name, table_type, array_agg(column_name::text) AS column_name
FROM columns
WHERE data_type IN ('tsvector')
GROUP BY  table_schema, table_name, table_type),
idx AS (SELECT 
n.nspname AS index_schema,
c.relname AS index_name,
c2.relname AS table_name,
i.indrelid AS index_table_oid,
indkey AS index_col
FROM pg_catalog.pg_index AS i INNER JOIN pg_catalog.pg_class AS c ON i.indexrelid=c.oid
INNER JOIN pg_catalog.pg_class AS c2 ON i.indrelid=c2.oid
INNER JOIN pg_catalog.pg_namespace n ON c.relnamespace=n.oid
INNER JOIN pg_catalog.pg_am a ON c.relam=a.oid
WHERE nspname NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL)
AND amname IN ('gin','gist')),
idx_unnest as (select index_name, index_schema, table_name, index_table_oid, index_col_num, ordin
from idx, unnest(idx.index_col) with ordinality as k(index_col_num, ordin)),
idx_with_names as (select index_name, index_schema, table_name, array_agg(a_idx.attname::text order by ordin) as idx_col
from idx_unnest k inner join pg_attribute a_idx on k.index_col_num = a_idx.attnum and k.index_table_oid = a_idx.attrelid and a_idx.attisdropped = false
group by index_name, index_schema, table_name)
SELECT format('CREATE INDEX idx_%2$s_%3$s ON %1$I.%2$I USING GIN (%3$I);', table_schema, table_name, column_name[1]) AS statements
FROM text_search_cols
WHERE NOT EXISTS (SELECT 1
FROM idx_with_names WHERE idx_with_names.index_schema=text_search_cols.table_schema AND idx_with_names.table_name=text_search_cols.table_name AND 
(idx_with_names.idx_col[1]=text_search_cols.column_name[1] OR (idx_with_names.idx_col@>text_search_cols.column_name AND text_search_cols.column_name@>idx_with_names.idx_col)))
ORDER BY table_schema, table_name, column_name;