This setting is used in the count and space filtertypes

This setting affects the sort order of the indices. True means reverse-alphabetical. This means that if all index names share the same pattern with a date—​e.g. index-2016.03.01—​older indices will be selected first.

The default value of this setting is True.

This setting is ignored if use_age is True.

There are context-specific examples of how reverse works in the count and space documentation.