Query Plan difference between 9.3 and 9.5 for the worse. Help !!!

9.3 Explain

 Index Scan using target_account_type_idx on targets t  (cost=3.92..146295.18 rows=701 width=42)

   Index Cond: ((account_id = ANY ('removed for privacy'::bigint[])) AND (type = 'KeyTransaction'::text))

   Filter: (SubPlan 1)

   SubPlan 1

     ->  Limit  (cost=91.69..91.69 rows=1 width=334)

           ->  Sort  (cost=91.69..92.14 rows=183 width=334)

                 Sort Key: c.id

                 ->  Nested Loop  (cost=0.85..90.77 rows=183 width=334)

                       ->  Index Scan using condition_targets_target_id_idx on condition_targets ct  (cost=0.43..14.68 rows=9 width=56)

                             Index Cond: (target_id = t.id)

                       ->  Index Scan using index_conditions_family_id_archived_at on conditions c  (cost=0.42..8.45 rows=1 width=278)

                             Index Cond: (family_id = ct.condition_family_id)

                             Filter: ((id >= ct.created_condition_id) AND ((id < ct.removed_condition_id) OR (ct.removed_condition_id IS NULL)))

(13 rows)

9.5 Explain

 Hash Join  (cost=655687.56..674049.55 rows=28 width=42)

   Hash Cond: (t.id = ct.target_id)

   ->  Index Scan using target_account_type_idx on targets t  (cost=0.56..18356.43 rows=1556 width=50)

         Index Cond: ((account_id = ANY ('{removed for privacy }'::bigint[])) AND

 (type = 'KeyTransaction'::text))

   ->  Hash  (cost=652267.43..652267.43 rows=273566 width=8)

         ->  HashAggregate  (cost=649531.77..652267.43 rows=273566 width=8)

               Group Key: ct.target_id

               ->  Nested Loop  (cost=2545.42..518241.47 rows=52516119 width=8)

                     ->  Bitmap Heap Scan on conditions c  (cost=2544.99..100917.01 rows=144108 width=16)

                           Recheck Cond: (archived_at IS NULL)

                           ->  Bitmap Index Scan on index_conditions_family_id_archived_at  (cost=0.00..2508.96 rows=144108 width=0)

                     ->  Index Scan using condition_targets_idx on condition_targets ct  (cost=0.43..2.53 rows=37 width=32)

                           Index Cond: ((condition_family_id = c.family_id) AND (c.id >= created_condition_id))

                           Filter: ((c.id < removed_condition_id) OR (removed_condition_id IS NULL))

(14 rows)