docs: public Set<String> postProcessingFields() {
          Set<String> fields = new LinkedHashSet<>();
          if (!StringUtils.isBlank(defaultField)) {
              fields.add(defaultField);
          }
          for (String term : query.split("[ ]")) {
              if (term.contains(":")) {
                  fields.add(term.split(":")[0]);
              }
          }
          return fields;
      }