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Field stats index constraints allows to omit all field stats for indices that don't match with the constraint. An index constraint can exclude indices' field stats based on the `min_value` and `max_value` statistic. This option is only useful if the `level` option is set to `indices`. For example index constraints can be useful to find out the min and max value of a particular property of your data in a time based scenario. The following request only returns field stats for the `answer_count` property for indices holding questions created in the year 2014: curl -XPOST 'http://localhost:9200/_field_stats?level=indices' -d '{ "fields" : ["answer_count"] <1> "index_constraints" : { <2> "creation_date" : { <3> "min_value" : { <4> "gte" : "2014-01-01T00:00:00.000Z", }, "max_value" : { "lt" : "2015-01-01T00:00:00.000Z" } } } }' Closes #11187