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* GH-3334: Add "embedded reaper" into CorrelationMH Fixes https://github.com/spring-projects/spring-integration/issues/3334 * Add `expireTimeout` property into `AbstractCorrelatingMessageHandler` to call newly introduced `purgeOrphanedGroups()` API for removing old groups from the store * Add `expireDuration` to perform `purgeOrphanedGroups()` task periodically * * Add Java DSL and XML support for `expireTimeout` and `expireDuration` options * Document the new feature * * Fix language in docs Co-authored-by: Gary Russell <grussell@vmware.com> Co-authored-by: Gary Russell <grussell@vmware.com>