The collection catalog stores metadata for each collection in one document. This includes an array of index specs for indexes belonging to the collection. Each index spec entry contains the 'ns' field, and with the removal of the restriction on collection name length, this has the potential to quickly hit the documents BSON limit.
There is already an 'ns' field at the top-level of the collection metadata document that could be used instead.
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DRIVERS-731 Handle absence of 'ns' field in index specifications returned from listIndexes
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SERVER-41697 Remove the 'ns' field from any existing index spec catalog entries during upgrade
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