My understanding is that you can upgrade directly from any patch level of 9.1 to 9.2. You do not need to install any, including the latest, 9.1 patch before installing 9.2. If there are any restrictions in this regard, they would be listed in the 9.2 installation notes.
We recently migrated from 9.1 sp2 to 9.14.0007. We are facing issue with the & in the search. In the search fields, if we provide & it returns & and not retriving any results. Can you please let me know is there any hot fix available for this?
Patch 0008, just release last night, is supposed to address this very issue. I haven't tested the fix yet, but I know the issue to which you are referring. Full details of the fixes can be found in the Release Notes.