private boolean rulesContainField(final List<DataRetentionRule> rules, final String... fields) {
        return rules.stream()
                .anyMatch(rule ->
                        NullSafe.test(
                                rule.getExpression(),
                                expr -> expr.containsField(fields)));
    }
@return True if any term in any rule expression uses at least one of {@code fields}.
stroom-meta/stroom-meta-impl-db/src/main/java/stroom/meta/impl/db/MetaDaoImpl.java