[Koha] DOM versus GRS-1

[Barry Cannon]

** Sorry if this double posted - having some problem with the list **
Hello,
        I recently upgraded a site from Koha 3.6 to 3.8.5 (via 3.8.3).
Shortly afterwards we noticed that there was quite a few biblios not
appearing on the search results even though they exist in the database.
After trying many, many things I decided to switch from DOM to grs-1 and
rebuild the indexes. This has resolved the problem and the search results
are now correct. Switching back to DOM brings back the problem.

Does anyone know why this might be the case - broadly speaking. Should DOM
and grs create the same index result set by using different filters or are
these types of differences expected?


Thanks
Barry