set rdb-snapshot-period to optional (#6739) (#12872)

Signed-off-by: Modular Magician <[email protected]>

Signed-off-by: Modular Magician <[email protected]>

Author: modular-magician

.changelog/6739.txt

@@ -0,0 +1,4 @@
+```release-note:bug
+redis: Updated`rdb_snapshot_period` to optional in the `persistence_config` resource.
+
+```

google/resource_redis_instance.go

@@ -318,8 +318,8 @@ resolution and up to nine fractional digits.`,
 						},
 						"rdb_snapshot_period": {
 							Type:         schema.TypeString,
-							Required:     true,
-							ValidateFunc: validateEnum([]string{"ONE_HOUR", "SIX_HOURS", "TWELVE_HOURS", "TWENTY_FOUR_HOURS"}),
+							Optional:     true,
+							ValidateFunc: validateEnum([]string{"ONE_HOUR", "SIX_HOURS", "TWELVE_HOURS", "TWENTY_FOUR_HOURS", ""}),
 							Description: `Optional. Available snapshot periods for scheduling.
 
 - ONE_HOUR:	Snapshot every 1 hour.

website/docs/r/redis_instance.html.markdown

@@ -418,7 +418,7 @@ The following arguments are supported:
   Possible values are `DISABLED` and `RDB`.
 
 * `rdb_snapshot_period` -
-  (Required)
+  (Optional)
   Optional. Available snapshot periods for scheduling.
   - ONE_HOUR:	Snapshot every 1 hour.
   - SIX_HOURS:	Snapshot every 6 hours.