public static _Fields findByThriftIdOrThrow(int fieldId) {
        _Fields fields = findByThriftId(fieldId);
        if (fields == null) throw new java.lang.IllegalArgumentException("Field " + fieldId + " doesn't exist!");
        return fields;
      }
Find the _Fields constant that matches fieldId, throwing an exception
if it is not found.
zipkin-collector/scribe/src/main/java/zipkin2/collector/scribe/generated/Scribe.java