fix acks to actual default

code/core-api-producer/src/main/java/com/redhat/training/kafka/coreapi/producer/Producer.java

@@ -55,7 +55,7 @@ public class Producer {
         props.put(ProducerConfig.VALUE_SERIALIZER_CLASS_CONFIG, org.apache.kafka.common.serialization.StringSerializer.class.getName());
 
         // Optional stuff.
-        props.put(ProducerConfig.ACKS_CONFIG, cf.getOptionalValue("producer.acks", String.class).orElse("1"));
+        props.put(ProducerConfig.ACKS_CONFIG, cf.getOptionalValue("producer.acks", String.class).orElse("all"));
         props.put(ProducerConfig.BATCH_SIZE_CONFIG, cf.getOptionalValue("producer.batch", String.class).orElse("16384"));
         props.put(ProducerConfig.LINGER_MS_CONFIG, cf.getOptionalValue("producer.linger", String.class).orElse("0"));
         props.put(ProducerConfig.RETRIES_CONFIG, cf.getOptionalValue("producer.retries", String.class).orElse("2147483647"));