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* INT-4377: aggregator groupTimeout as Date JIRA: https://jira.spring.io/browse/INT-4377 Change the `groupTimeoutExpression` logic to let it to be evaluated to `Date` instance for some fine-grained scheduling use-case, e.g. to determine a scheduling moment from the group creation time (`timestamp`) instead of a current message arrival * Fix language in docs accoridng PR review Co-authored-by: Gary Russell <grussell@vmware.com> Co-authored-by: Gary Russell <grussell@vmware.com>