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As explained in #11831, we currently have uuid fields on the cluster state, meta data and index metadata. The latter two are persistent across changes are being effectively used as a persistent uuid for this cluster and a persistent uuid for an index. The first (ClusterState.uuid) is ephemeral and changes with every change to the cluster state. This is confusing, We settled on having the following, new names: -> ClusterState.uuid -> stateUUID (transient) -> MetaData.uuid -> clusterUUID (persistent) -> IndexMetaData.uuid -> indexUUID (persistent). Closes #11914 Closes #11831