Toolforge's elasticsearch cluster is being upgraded and replaced by a new cluster T236606. @Surlycyborg could you please confirm that the similarity tool is still using the cluster and will need its data migrated from the existing cluster to the new one?
Index information
index docs.count store.size similarity_201902150900 276013 6.7gb similarity_201903220900 287618 7.0gb similarity_201805220900 159592 4.8gb