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#21817 introduced the notion of a cluster state applier and banned those for sampling the cluster state directly (as it is not applied yet). Testing has exposed one exceptional use case - if the appliers want to spawn off a follow up it may require waiting for specific new cluster state (for example, the shard started action, called by the IndicesClusterStateService, may run into trouble connecting to the master and wait for a new master to be elected). This requires creating an observer which, in turn, samples the cluster state. An example failure can be seen at https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch+master+periodic/1701/console This commit allows creating an observer from a cluster state applier. The observer is adapted to exclude any potential old cluster state in its logic.