/**
     * The auto expand replicas for doc.
     */
    @Size(max = 10)
    public String autoExpandReplicasForDoc = ComponentUtil.getFessConfig().getIndexAutoExpandReplicas();

        final FessConfig fessConfig = ComponentUtil.getFessConfig();
        return createIndex(index, indexName, fessConfig.getIndexNumberOfShards(), fessConfig.getIndexAutoExpandReplicas(), true);
    }

    /**
     * Creates a new index with specified settings.
     *
     * @param index              the index configuration name

     * 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.