There is no synchronization to protect this variable from being accessed concurrently, which may cause concurrent writers to write out incorrect "multikeyPath" information to catalog documents.
Extend the KVCatalog to store path-level multikeyness info
validate should report when an index's 'multikeyPaths' are set but the 'multikey' flag is false
Log a startup warning when an index has 'multikeyPaths' but the 'multikey' flag is set to false
Update repair to fix multikey errors without performing an index rebuild