In our codebase we sometimes need to call FeatureFlagUtil.isPresentAndEnabled in order to verify that a feature flag is in use.

In a sharded cluster deployment, this check will proceed to execute against a data-bearing shard since it can't run against mongos. However, in the case there are no shards present this check will fail the test since it can't find any data-bearing shard.

Checking against the config shard should be seen as the preferred option since in a sharded cluster we have a guarantee that it will always have a config shard.