* comment: Auto expand replicas setting for the index.
     * @return The value of found property. (NotNull: if not found, exception but basically no way)
     */
    String getIndexAutoExpandReplicas();

    /**
     * Get the value for the key 'index.id.digest.algorithm'. <br>
     * The value is, e.g. SHA-512 <br>
     * comment: Digest algorithm for index IDs.