According to Microsoft, Microsoft Windows Server 2019 still does not support Windows Search on Data Deduplication enabled volumes (source):
Windows Search doesn't support Data Deduplication. Data Deduplication uses reparse points, which Windows Search can't index, so Windows Search skips all deduplicated files, excluding them from the index. As a result, search results might be incomplete for deduplicated volumes. Vote for this item for Windows Server vNext on the Windows Server Storage UserVoice.
This has been a problem/challenge for a long time now (example).
I am maintaining a Windows Server 2019 file server, that stores its data on a Data Deduplication enabled ReFS-Volume and I am also facing the problem to provide a working search functionality.
Before implementing a solution by using a 3rd party search engine, I'd like to know if there are already any workarounds available to make Windows Search work on Data Deduplication enabled volumes by using on-board tools.
So, if someone is aware of a valid workaround, I'd appreciate any information on a way to implement this without using 3rd party software.