Missing or existing collections and conflicting index definitions.
26
NamespaceNotFound: ns does not exist or ns not foundA command that needs an existing collection (listIndexes, dropIndexes, collMod, renameCollection) named one that does not exist.
48
NamespaceExists: collection already existsA create or rename targets a name already used by a collection with other options, a view or a time series collection.
85
IndexOptionsConflict: an equivalent index already exists (and 86 IndexKeySpecsConflict)createIndex conflicts with an existing index: same index with other options or name (85), or the name belongs to a different index (86).
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