Query to get latest comment of each user in the month

Elastic Stack Elasticsearch
1

I have a es index which is of the following structure
User: 1, timestamp: 13-5-2014, comment: "abcded"
User: 2, timestamp: 10-5-2014, comment: "abcded"
User: 1, timestamp: 12-5-2014, comment: "abcded"
User: 2, timestamp: 8-5-2014, comment: "abcded"
User: 3, timestamp: 5-5-2014, comment: "abcded"
User: 3, timestamp: 7-5-2014, comment: "abcded"

I have been trying to think of a query using facets or aggregations to get
the last comment of the month for each user.
For example the result would be from the above the bold only

User: 1, timestamp: 13-5-2014, comment: "abcded"
User: 2, timestamp: 10-5-2014, comment: "abcded"
User: 3, timestamp: 7-5-2014, comment: "abcded"

Is there any way to do this?

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2

Not at the moment. However you can do a terms agg on user, then nest a max
agg on the timestamp. Then from the results that come back, you will need
to run a second _search to retrieve the comment values (using the user +
timestamp combo for each bucket from the aggs).

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