[hotfix][redis] fix npe cause by null host parameter (#8881)

Author: fcb-xiaobo

Diff for: docs/en/connector-v2/sink/Redis.md

@@ -14,8 +14,8 @@ Used to write data to Redis.
 
 | name               | type    |       required        | default value |
 |--------------------|---------|-----------------------|---------------|
-| host               | string  | yes                   | -             |
-| port               | int     | yes                   | -             |
+| host               | string  | yes  when mode=single | -             |
+| port               | int     | no                    | 6379          |
 | key                | string  | yes                   | -             |
 | data_type          | string  | yes                   | -             |
 | batch_size         | int     | no                    | 10            |

Diff for: docs/en/connector-v2/source/Redis.md

@@ -18,9 +18,9 @@ Used to read data from Redis.
 ## Options
 
 | name                | type   | required              | default value |
-| ------------------- | ------ | --------------------- | ------------- |
-| host                | string | yes                   | -             |
-| port                | int    | yes                   | -             |
+| ------------------- | ------ |-----------------------| ------------- |
+| host                | string | yes when mode=single  | -             |
+| port                | int    | no                    | 6379          |
 | keys                | string | yes                   | -             |
 | batch_size          | int    | yes                   | 10            |
 | data_type           | string | yes                   | -             |

Diff for: docs/zh/connector-v2/sink/Redis.md

@@ -14,8 +14,8 @@
 
 | name               | type    |       required        | default value |
 |--------------------|---------|-----------------------|---------------|
-| host               | string  | yes                   | -             |
-| port               | int     | yes                   | -             |
+| host               | string  | `mode=single`时必须      | -             |
+| port               | int     | no                    | 6379          |
 | key                | string  | yes                   | -             |
 | data_type          | string  | yes                   | -             |
 | batch_size         | int     | no                    | 10            |

Diff for: docs/zh/connector-v2/source/Redis.md

@@ -19,8 +19,8 @@
 
 | 名称                  | 类型     | 是否必须               | 默认值    |
 |---------------------|--------|--------------------|--------|
-| host                | string | 是                  | -      |
-| port                | int    | 是                  | -      |
+| host                | string | `mode=single`时必须   | -      |
+| port                | int    | 否                  | 6379   |
 | keys                | string | 是                  | -      |
 | batch_size          | int    | 是                  | 10     |
 | data_type           | string | 是                  | -      |

Diff for: seatunnel-connectors-v2/connector-redis/src/main/java/org/apache/seatunnel/connectors/seatunnel/redis/config/RedisBaseOptions.java

@@ -38,7 +38,7 @@ public enum RedisMode {
                     .withDescription("redis hostname or ip");
 
     public static final Option<Integer> PORT =
-            Options.key("port").intType().noDefaultValue().withDescription("redis port");
+            Options.key("port").intType().defaultValue(6379).withDescription("redis port");
 
     public static final Option<String> AUTH =
             Options.key("auth")

Diff for: seatunnel-connectors-v2/connector-redis/src/main/java/org/apache/seatunnel/connectors/seatunnel/redis/config/RedisParameters.java

@@ -46,7 +46,7 @@
 @Slf4j
 public class RedisParameters implements Serializable {
     private String host;
-    private int port;
+    private Integer port;
     private String auth = "";
     private int dbNum;
     private String user = "";