It's hard to find and fix every legacy on-premises setting. In the case of OneDrive for Business, it allows users to stop their site appearing in search results. That doesn't sound too bad, but blocking search affects many other Office 365 features and it's a good example of how a legacy setting can have a big influence in the cloud. Fortunately Microsoft agrees and they're going to fix the problem. We don't know when or how the fix will come, but when it does, users won't be able to disable eDiscovery for their OneDrive for Business site.