*
         * @param source    The source value
         * @param fieldName A description of the field being interpolated. The implementation may use this to
         *                  log stuff.
         * @return The interpolated value.
         */
        String transform(String source, String fieldName);
    }

    /**
     * Find field using cache for improved performance.
     */
    private Field findCachedField(Class<?> beanType, String fieldName) {
        Map<String, Field> classFieldCache = FIELD_CACHE.computeIfAbsent(beanType, this::buildFieldCache);
        return classFieldCache.get(fieldName);
    }

    /**
     * Build field cache for a class.
     */
    private Map<String, Field> buildFieldCache(Class<?> beanType) {

internal fun <T> readFieldOrNull(
  instance: Any,
  fieldType: Class<T>,
  fieldName: String,
): T? {
  var c: Class<*> = instance.javaClass
  while (c != Any::class.java) {
    try {
      val field = c.getDeclaredField(fieldName)
      field.isAccessible = true
      val value = field.get(instance)

         * @param source The source value
         * @param fieldName A description of the field being interpolated. The implementation may use this to
         *                           log stuff.
         * @return The interpolated value.
         */
        String transform(String source, String fieldName);
    }

         *
         * @param source The source value
         * @param fieldName A description of the field being interpolated. The implementation may use this to
         *         log stuff.
         * @return The interpolated value.
         */
        String transform(String source, String fieldName);
    }

         * @param source The source value
         * @param fieldName A description of the field being interpolated. The implementation may use this to
         *                           log stuff.
         * @return The interpolated value.
         */
        String transform(String source, String fieldName);
    }

          "type": "keyword"
        },
        "match": "*",
        "match_mapping_type": "string"
      }
    }
  ],
  "properties": {
    "settingsType": {
      "type": "keyword"
    },
    "fieldName": {
      "type": "keyword"
    },
    "readingAnalyzer": {
      "type": "keyword"
    },
    "readingTermAnalyzer": {
      "type": "keyword"
    },
    "normalizeAnalyzer": {
      "type": "keyword"

         *
         * @param source    The source value
         * @param fieldName A description of the field being interpolated. The implementation may use this to
         *                  log stuff.
         * @return the interpolated value
         */
        String transform(String source, String fieldName);
    }

    @Nonnull
    static XmlReaderRequestBuilder builder() {

     */
    private void setPrivateField(Object obj, String fieldName, Object value) throws Exception {
        Field field = obj.getClass().getDeclaredField(fieldName);
        field.setAccessible(true);
        field.set(obj, value);
    }

    /**
     * Helper method to get private field value using reflection
     */
    private Object getPrivateField(Object obj, String fieldName) throws Exception {

            return createQueryBuilder().buildQuery(q, fields);
        }

        public QueryBuilder buildFilterQuery(String fieldName, List<String> words) {
            return createQueryBuilder().buildFilterQuery(fieldName, words);
        }

        public QueryBuilder buildFunctionScoreQuery(String query, QueryBuilder queryBuilder) {