CREATE TABLE test (
  doc JSONB NOT NULL
);

CREATE INDEX ON test USING GIN (doc);

INSERT INTO test (doc)
SELECT ('{"id" : "' || gen_random_uuid() || 
      '", "timestamp" : "' || (now() + (n || ' microseconds')::INTERVAL) || 
      '", "flag1" :  ' || (case when (n % 2 = 0) then 'true' else 'false' end) || 
      ', "flag2" :  ' || (case when (n % 23 = 0) then 'true' else 'false' end) || 
      ', "string1" : "testa' || (n % 13) || 
      '", "string2" : "testb' || (n % 23) || 
      '"}')::json
FROM
(select generate_series(1, 100000) as n) AS x;

ANALYSE test;