Document date math use in the rollover API (#20780)
Document date math use in the rollover API (#20780)

* Document date math use in the rollover API

Relates to #20709


strapdata/elassandra5-rc,strapdata/elassandra5-rc,strapdata/elassandra5-rc,strapdata/elassandra5-rc,strapdata/elassandra5-rc