tcn.lms.element.v1alpha1.Element.Process.ContactManagerSink.DeDuplicationMergeStrategy(DeDuplicationMergeStrategy)
(-- api-linter: core::0126::unspecified=disabled
aip.dev/not-precedent: We need to keep the numbering the same since this existed before we started aip . --)
DeDuplicationMergeStrategy specifies how to handle duplicate contacts when found.
"DE_DUPLICATION_MERGE_STRATEGY_KEEP_EXISTING_LIST"