public Integer getHttpAdminOffset() {
        if (httpAdminOffset == null) {
            for (int p = 0; p < getNumPorts(); p++) {
                if (contains(p, "http") && contains(p, "admin")) {
                    httpAdminOffset = p;
                    break;
                }
            }
        }
        return httpAdminOffset;
    }
Get the offset to the http port used for admin.
@return Integer the offset, or null if none set.
config-model/src/main/java/com/yahoo/vespa/model/PortsMeta.java