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eaf672f612
This change is to support rolling upgrade from a pre-6.3 default distribution (i.e. without X-Pack) to a 6.3+ default distribution (i.e. with X-Pack). The ML metadata is no longer eagerly added to the cluster state as soon as the master node has X-Pack available. Instead, it is added when the first ML job is created. As a result all methods that get the ML metadata need to be able to handle the situation where there is no ML metadata in the current cluster state. They do this by behaving as though an empty ML metadata was present. This logic is encapsulated by always asking for the current ML metadata using a static method on the MlMetadata class. Relates #30731
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