src/main/java/org/opensearch/security/securityconf/ConfigModelV6.java [906:922]:
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    private static String replaceProperties(String orig, User user) {

        if (user == null || orig == null) {
            return orig;
        }

        orig = orig.replace("${user.name}", user.getName()).replace("${user_name}", user.getName());
        orig = replaceRoles(orig, user);
        for (Entry<String, String> entry : user.getCustomAttributesMap().entrySet()) {
            if (entry == null || entry.getKey() == null || entry.getValue() == null) {
                continue;
            }
            orig = orig.replace("${" + entry.getKey() + "}", entry.getValue());
            orig = orig.replace("${" + entry.getKey().replace('.', '_') + "}", entry.getValue());
        }
        return orig;
    }
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src/main/java/org/opensearch/security/securityconf/ConfigModelV7.java [906:922]:
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    private static String replaceProperties(String orig, User user) {

        if (user == null || orig == null) {
            return orig;
        }

        orig = orig.replace("${user.name}", user.getName()).replace("${user_name}", user.getName());
        orig = replaceRoles(orig, user);
        for (Entry<String, String> entry : user.getCustomAttributesMap().entrySet()) {
            if (entry == null || entry.getKey() == null || entry.getValue() == null) {
                continue;
            }
            orig = orig.replace("${" + entry.getKey() + "}", entry.getValue());
            orig = orig.replace("${" + entry.getKey().replace('.', '_') + "}", entry.getValue());
        }
        return orig;
    }
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