* The value is, e.g. default <br>
     * comment: Codec type for the index.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getIndexCodec();

    /**
     * Get the value for the key 'index.number_of_shards'. <br>
     * The value is, e.g. 5 <br>
     * comment: Number of primary shards for the index.

        }
        source = source.replaceAll(Pattern.quote("${fess.dictionary.path}"), dictionaryPath)//
                .replaceAll(Pattern.quote("${fess.index.codec}"), fessConfig.getIndexCodec())//
                .replaceAll(Pattern.quote("${fess.index.number_of_shards}"), numberOfShards)//
                .replaceAll(Pattern.quote("${fess.index.auto_expand_replicas}"), autoExpandReplicas);