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We have recently added support for providing a local cluster alias to a SearchRequest through a package protected constructor. When executing cross-cluster search requests with local reduction on each cluster, the CCS coordinating node will have to provide such cluster alias to each remote cluster, as well as the absolute start time of the search action in milliseconds from the time epoch, to be used when evaluating date math expressions both while executing queries / scripts as well as when resolving index names. This commit adds support for providing the start time together with the cluster alias. It is a final member in the search request, which will only be set when using cross-cluster search with local reduction (also known as alternate execution mode). When not provided, the coordinating node will determine the current time and pass it through (by calling `System.currentTimeMillis`). Relates to #32125