MINOR: Do not override retries for idempotent producers (#8097)

The KafkaProducer code would set infinite retries (MAX_INT) if the producer was configured with idempotence and no retries were configured by the user. This is superfluous because KIP-91 changed the retry functionality to both be time-based and the default retries config to be MAX_INT.

Reviewers: Jason Gustafson <jason@confluent.io>

clients/src/main/java/org/apache/kafka/clients/producer/KafkaProducer.java

@@ -459,7 +459,6 @@ public class KafkaProducer<K, V> implements Producer<K, V> {
                 apiVersions,
                 throttleTimeSensor,
                 logContext);
-        int retries = configureRetries(producerConfig, log);
         short acks = configureAcks(producerConfig, log);
         return new Sender(logContext,
                 client,
@@ -468,7 +467,7 @@ public class KafkaProducer<K, V> implements Producer<K, V> {
                 maxInflightRequests == 1,
                 producerConfig.getInt(ProducerConfig.MAX_REQUEST_SIZE_CONFIG),
                 acks,
-                retries,
+                producerConfig.getInt(ProducerConfig.RETRIES_CONFIG),
                 metricsRegistry.senderMetrics,
                 time,
                 requestTimeoutMs,
@@ -527,15 +526,6 @@ public class KafkaProducer<K, V> implements Producer<K, V> {
         return transactionManager;
     }
 
-    private static int configureRetries(ProducerConfig config, Logger log) {
-        boolean userConfiguredRetries = config.originals().containsKey(ProducerConfig.RETRIES_CONFIG);
-        if (config.idempotenceEnabled() && !userConfiguredRetries) {
-            log.info("Overriding the default retries config to the recommended value of {} since the idempotent " +
-                    "producer is enabled.", Integer.MAX_VALUE);
-        }
-        return config.getInt(ProducerConfig.RETRIES_CONFIG);
-    }
-
     private static int configureInflightRequests(ProducerConfig config) {
         if (config.idempotenceEnabled() && 5 < config.getInt(ProducerConfig.MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION)) {
             throw new ConfigException("Must set " + ProducerConfig.MAX_IN_FLIGHT_REQUESTS_PER_CONNECTION + " to at most 5" +