Do not use network aliases in KAFKA_CONTROLLER_QUORUM_VOTERS (#9144)

Fixes #9143

Author: eddumelendez

modules/kafka/src/main/java/org/testcontainers/containers/KafkaContainer.java

@@ -331,13 +331,7 @@ void withRaft() {
             addEnvVar("KAFKA_LISTENERS", kafkaListeners());
             addEnvVar("KAFKA_PROCESS_ROLES", "broker,controller");
 
-            String firstNetworkAlias = getNetworkAliases().stream().findFirst().orElse(null);
-            String networkAlias = getNetwork() != null ? firstNetworkAlias : "localhost";
-            String controllerQuorumVoters = String.format(
-                "%s@%s:9094",
-                getEnvVars().get("KAFKA_NODE_ID"),
-                networkAlias
-            );
+            String controllerQuorumVoters = String.format("%s@localhost:9094", getEnvVars().get("KAFKA_NODE_ID"));
             this.envVars.computeIfAbsent("KAFKA_CONTROLLER_QUORUM_VOTERS", key -> controllerQuorumVoters);
             addEnvVar("KAFKA_CONTROLLER_LISTENER_NAMES", "CONTROLLER");
 

modules/kafka/src/main/java/org/testcontainers/kafka/ConfluentKafkaContainer.java

@@ -45,9 +45,7 @@ public ConfluentKafkaContainer(DockerImageName dockerImageName) {
     protected void configure() {
         KafkaHelper.resolveListeners(this, this.listeners);
 
-        String firstNetworkAlias = getNetworkAliases().stream().findFirst().orElse(null);
-        String networkAlias = getNetwork() != null ? firstNetworkAlias : "localhost";
-        String controllerQuorumVoters = String.format("%s@%s:9094", getEnvMap().get("KAFKA_NODE_ID"), networkAlias);
+        String controllerQuorumVoters = String.format("%s@localhost:9094", getEnvMap().get("KAFKA_NODE_ID"));
         withEnv("KAFKA_CONTROLLER_QUORUM_VOTERS", controllerQuorumVoters);
     }
 

modules/kafka/src/main/java/org/testcontainers/kafka/KafkaContainer.java

@@ -52,9 +52,7 @@ public KafkaContainer(DockerImageName dockerImageName) {
     protected void configure() {
         KafkaHelper.resolveListeners(this, this.listeners);
 
-        String firstNetworkAlias = getNetworkAliases().stream().findFirst().orElse(null);
-        String networkAlias = getNetwork() != null ? firstNetworkAlias : "localhost";
-        String controllerQuorumVoters = String.format("%s@%s:9094", getEnvMap().get("KAFKA_NODE_ID"), networkAlias);
+        String controllerQuorumVoters = String.format("%s@localhost:9094", getEnvMap().get("KAFKA_NODE_ID"));
         withEnv("KAFKA_CONTROLLER_QUORUM_VOTERS", controllerQuorumVoters);
     }