Change DefaultObjectMapper to NOT overwrite final fields unless explicitly asked to

extensions/rabbitmq/src/main/java/io/druid/firehose/rabbitmq/RabbitMQFirehoseFactory.java

@@ -123,7 +123,7 @@ public class RabbitMQFirehoseFactory implements FirehoseFactory<StringInputRowPa
     return config;
   }
 
-  @JsonProperty
+  @JsonProperty("connection")
   public JacksonifiedConnectionFactory getConnectionFactory()
   {
     return connectionFactory;

indexing-hadoop/src/main/java/io/druid/indexer/HadoopTuningConfig.java

@@ -138,7 +138,7 @@ public class HadoopTuningConfig implements TuningConfig
     return indexSpec;
   }
 
-  @JsonProperty
+  @JsonProperty("maxRowsInMemory")
   public int getRowFlushBoundary()
   {
     return rowFlushBoundary;

indexing-service/src/main/java/io/druid/indexing/common/task/MoveTask.java

@@ -106,7 +106,7 @@ public class MoveTask extends AbstractFixedIntervalTask
     return TaskStatus.success(getId());
   }
 
-  @JsonProperty
+  @JsonProperty("target")
   public Map<String, Object> getTargetLoadSpec()
   {
     return targetLoadSpec;

processing/src/main/java/io/druid/jackson/DefaultObjectMapper.java

@@ -53,6 +53,7 @@ public class DefaultObjectMapper extends ObjectMapper
     configure(MapperFeature.AUTO_DETECT_FIELDS, false);
     configure(MapperFeature.AUTO_DETECT_IS_GETTERS, false);
     configure(MapperFeature.AUTO_DETECT_SETTERS, false);
+    configure(MapperFeature.ALLOW_FINAL_FIELDS_AS_MUTATORS, false);
     configure(SerializationFeature.INDENT_OUTPUT, false);
   }