ELasticsearch Query

Need to get count of documents based condition We do have an index having customers and orders information , we need to retrieve count of unique customers which have placed on order on particular range and unique 1. Get unique count of customers which have ordered today itself - it should not have any orders placed earlier. 2. Get unique count of customers which have not orders in particualr range but placed order at particualr date - festive date 3. Get unique count of customer which have not orders in particular range but orderd today only - was inactive for long time. 4. Getting uniqye customers - exact number we do have around 3L documents which needs to be referenced