docs: public InternalIndex match(String attribute, QueryContext.IndexMatchHint matchHint) {
          Record record = registry.get(attribute);
          if (record == null) {
              return null;
          }
  
          switch (matchHint) {
              case NONE:
                  // Intentional fallthrough. We still prefer ordered indexes
                  // under the cover since they are more universal in terms of
                  // supported fast queries.
              case PREFER_ORDERED:
                  InternalIndex ordered = record.ordered;
                  return ordered == null ? record.unordered : ordered;
              case PREFER_UNORDERED:
                  InternalIndex unordered = record.unordered;
                  return unordered == null ? record.ordered : unordered;
              default:
                  throw new IllegalStateException("unexpected match hint: " + matchHint);
          }
      }