MongosProcessInterface::fieldsHaveSupportingUniqueIndex checks that a unique index exists to support given field paths by sending listIndexes to the primary shard for a namespace. As of SERVER-45103, the primary shard for a sharded collection isn't guaranteed to have correct indexes, so instead listIndexes should be sent with a shard version to a shard that owns at least one chunk. Additionally, for unsharded collections, the listIndexes should be sent with a database version to handle movePrimary.