@org.apache.thrift.annotation.Nullable
    public java.lang.Object getFieldValue(_Fields field) {
      switch (field) {
      case MESSAGES:
        return getMessages();

      }
      throw new java.lang.IllegalStateException();
    }
Returns true if field messages is set (has been assigned a value) and false otherwise
zipkin-collector/scribe/src/main/java/zipkin2/collector/scribe/generated/Scribe.java