Instead of using the bloom index, a parallel sequencial scan is used with this example

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Page: https://www.postgresql.org/docs/12/bloom.html
Description:

postgres=# CREATE TABLE tbloom AS
postgres-#    SELECT
postgres-#      (random() * 1000000)::int as i1,
postgres-#      (random() * 1000000)::int as i2,
postgres-#      (random() * 1000000)::int as i3,
postgres-#      (random() * 1000000)::int as i4,
postgres-#      (random() * 1000000)::int as i5,
postgres-#      (random() * 1000000)::int as i6
postgres-#    FROM
postgres-#   generate_series(1,10000000);
SELECT 10000000
postgres=# CREATE INDEX bloomidx ON tbloom USING bloom (i1, i2, i3, i4, i5,
i6);
ERROR:  access method "bloom" does not exist
postgres=# create extension bloom;
CREATE EXTENSION
postgres=# CREATE INDEX bloomidx ON tbloom USING bloom (i1, i2, i3, i4, i5,
i6);
CREATE INDEX
postgres=# CREATE index btreeidx ON tbloom (i1, i2, i3, i4, i5, i6);
CREATE INDEX
postgres=# EXPLAIN ANALYZE SELECT * FROM tbloom WHERE i2 = 898732 AND i5 =
123451;
QUERY PLAN

---------------------------------------------------------------------------------------------------------------------------
Gather  (cost=1000.00..127220.00 rows=250 width=24) (actual
time=974.467..974.513 rows=0 loops=1)
Workers Planned: 2
Workers Launched: 2
->  Parallel Seq Scan on tbloom  (cost=0.00..126195.00 rows=104 width=24)
(actual time=895.448..895.448 rows=0 loops=3)
Filter: ((i2 = 898732) AND (i5 = 123451))
Rows Removed by Filter: 3333333
Planning Time: 16.006 ms
Execution Time: 974.635 ms
(8 rows)

postgres=# analyze tbloom;
ANALYZE
postgres=# EXPLAIN ANALYZE SELECT * FROM tbloom WHERE i2 = 898732 AND i5 =
123451;
QUERY PLAN

-------------------------------------------------------------------------------------------------------------------------
Gather  (cost=1000.00..127195.82 rows=1 width=24) (actual
time=803.314..803.436 rows=0 loops=1)
Workers Planned: 2
Workers Launched: 2
->  Parallel Seq Scan on tbloom  (cost=0.00..126195.72 rows=1 width=24)
(actual time=775.911..775.911 rows=0 loops=3)
Filter: ((i2 = 898732) AND (i5 = 123451))
Rows Removed by Filter: 3333333
Planning Time: 0.416 ms
Execution Time: 803.471 ms
(8 rows)