If I'm doing an data table aggregation on apache logs, by client IP then useragent, currently if the useragent field is missing then I will see no result for that IP. When ES returns "buckets":[], could there be an option to still show these records, with maybe a blank field? I tried the JSON input with a script to insert a result in the empty bucket but I couldn't get it to work #1910, although even if it did, not sure if it would be as performant.