* @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);
    }

    }

    protected static Analyzer getAnalyzer(final boolean ignoreCase) {
        return new Analyzer() {
            @Override
            protected TokenStreamComponents createComponents(final String fieldName) {
                final Tokenizer tokenizer = new KeywordTokenizer();
                final TokenStream stream = ignoreCase ? new LowerCaseFilter(tokenizer) : tokenizer;

     * This method appends the new sort to existing default sorts.
     *
     * @param fieldName the field name to sort by
     * @param order the sort order ("ASC" or "DESC")
     */
    public void addDefaultSort(final String fieldName, final String order) {
        final List<SortBuilder<?>> list = new ArrayList<>();
        if (defaultSortBuilders != null) {

      if (varyFields.isEmpty()) return Headers.EMPTY

      val result = Headers.Builder()
      for (i in 0 until requestHeaders.size) {
        val fieldName = requestHeaders.name(i)
        if (fieldName in varyFields) {
          result.add(fieldName, requestHeaders.value(i))
        }
      }
      return result.build()
    }
  }

        );
    }

    // Helper methods

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

    private void setResponseAsReceived(Smb2NegotiateResponse resp) throws Exception {

            propMap.put(CRAWLER_METADATA_NAME_MAPPING, params);
        }
        return params.get(name);
    }

    default void addCrawlerMetadataNameMapping(final String name, final String fieldName, final String mappingType,
            final String dateFormat) {
        if (getCrawlerMetadataNameMapping(name) != null) {
            return;
        }

        @SuppressWarnings("unchecked")

        <field xml.tagName="role-hint">
          <name>roleHint</name>
          <type>String</type>
          <description></description>
        </field>
        <field xml.tagName="field-name">
          <name>fieldName</name>
          <required>true</required>
          <type>String</type>
          <description>The field name which has this requirement.</description>
        </field>
      </fields>
    </class>

 * <li><code>merge<i>Classname</i>( <i>Classname</i> target, <i>Classname</i> source, boolean sourceDominant,
 * Map&lt;Object, Object&gt; context )</code> for each model class</li>
 * <li><code>merge<i>Classname</i>_<i>FieldName</i>( <i>Classname</i> target, <i>Classname</i> source, boolean
 * sourceDominant, Map&lt;Object, Object&gt; context )</code> for each field of each model class</li>

        boolQueryBuilder
                .must(QueryBuilders.rangeQuery(FieldNames.TIMESTAMP).lt(time.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli()));

        boolQueryBuilder.must(QueryBuilders.termQuery(FieldNames.KINDS, SuggestItem.Kind.DOCUMENT.toString()));
        boolQueryBuilder.mustNot(QueryBuilders.termQuery(FieldNames.KINDS, SuggestItem.Kind.QUERY.toString()));

        map.put(FieldNames.LANGUAGES, languages);
        map.put(FieldNames.KINDS, Stream.of(kinds).map(Kind::toString).toArray());
        map.put(FieldNames.QUERY_FREQ, queryFreq);
        map.put(FieldNames.DOC_FREQ, docFreq);
        map.put(FieldNames.USER_BOOST, userBoost);
        map.put(FieldNames.SCORE, (queryFreq + docFreq) * userBoost);
        map.put(FieldNames.TIMESTAMP, timestamp.toInstant().toEpochMilli());
        return map;