Fix Jedis cluster connection lookup for IPv6 hosts.

We previously used our own mechanism to Render Host and Port causing that IPv6 addresses were enclosed in brackets.

Now we've aligned with Jedis' keying by using HostAndPort that just concatenates the host and port part.

Closes #3015

Author: mp911de

src/main/java/org/springframework/data/redis/connection/jedis/JedisClusterConnection.java

@@ -20,6 +20,8 @@
 import redis.clients.jedis.HostAndPort;
 import redis.clients.jedis.Jedis;
 import redis.clients.jedis.JedisCluster;
+import redis.clients.jedis.JedisClusterInfoCache;
+import redis.clients.jedis.Protocol;
 import redis.clients.jedis.providers.ClusterConnectionProvider;
 
 import java.time.Duration;
@@ -764,11 +766,16 @@ public Jedis getResourceForSpecificNode(RedisClusterNode node) {
 			throw new DataAccessResourceFailureException(String.format("Node %s is unknown to cluster", node));
 		}
 
+		@Nullable
 		private ConnectionPool getResourcePoolForSpecificNode(RedisClusterNode node) {
 
 			Map<String, ConnectionPool> clusterNodes = cluster.getClusterNodes();
-			if (clusterNodes.containsKey(node.asString())) {
-				return clusterNodes.get(node.asString());
+			HostAndPort hap = new HostAndPort(node.getHost(),
+					node.getPort() == null ? Protocol.DEFAULT_PORT : node.getPort());
+			String key = JedisClusterInfoCache.getNodeKey(hap);
+
+			if (clusterNodes.containsKey(key)) {
+				return clusterNodes.get(key);
 			}
 
 			return null;