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The ID of the DREINITIAL index action to process, when multiple index actions are sent.
In a system with an array of DIHs, a DREINITIAL index action might be sent to a server multiple times. If there was a delay in sending a subsequent index action, documents might be deleted that in fact arrived after the original DREINITIAL.
The InitialID parameter ensures that when a DREINITIAL index action is received by a server multiple times, only the first index action (identified by the InitialID) is processed, and the rest are ignored.