}
    }

    /**
     * Adds a rewrite rule for document mappings.
     *
     * @param rule the rewrite rule to apply to document mappings
     */
    public void addDocumentMappingRewriteRule(final UnaryOperator<String> rule) {
        docMappingRewriteRuleList.add(rule);
    }

    /**
     * Updates index aliases to point to a new index.
     *