SSAGE_FIELD_NUMBER = 0;     private io.confluent.kafka.serializers.protobuf.test.NestedTestProto.NestedMessage nestedMessage_;     /**      * <code>.io.confluent.kafka.serializers.protobuf.test.NestedMessage nested_message = 0;</code>      * @return Whether the nestedMessage field is set.      */     public boolean has