Optional.java

        final Optional<Pattern> customerNamePattern = filters.stream().filter(m -> "customerName".equals(m.get("t")))
            .map(m -> m.get("_id_").toString().trim())
            .findAny()
            .map(pattern -> Pattern.compile(pattern, Pattern.CASE_INSENSITIVE));

        final Optional<String> customerEmail = filters.stream().filter(m -> "customerEmail".equals(m.get("t")))
            .map(m -> m.get("_id_").toString().trim())
            .findAny();

        final Predicate<Customer> customerFilter = c ->
            customerEmail.map(email -> c.EMAIL.hasData() && email.equalsIgnoreCase(c.EMAIL.get())).orElse(true) &&
            customerNamePattern.map(pattern -> pattern.matcher(c.getCompleteName()).find()).orElse(true);