allowPartialResult property
For queries against a sharded collection, allows the command (or subsequent getMore commands) to return partial results, rather than an error, if one or more queried shards are unavailable. Starting in MongoDB 4.4, if find (or subsequent getMore commands) returns partial results due to the unavailability of the queried shard(s), the output includes a partialResultsReturned indicator field. If the queried shards are initially available for the find command but one or more shards become unavailable in subsequent getMore commands, only the getMore commands run when a queried shard or shards are unavailable include the partialResultsReturned flag in the output.
Implementation
final bool allowPartialResult;