Search doesn't find stuff anymore, and returns unreliable results
I've been called to debug the following issue with a CA providence installation:
Since recently (without any change from the admin side that they are aware of), the search stopped showing entries that are definitely there. The database already contains several thousands of entries and is in active use since a few years.
The first thing that was done was rebuilding the search-indices in the Administration menu: Since then, the search seems completely broken.
1) Searching for "*" (entities) returns thousands of entries, but when searching for e.g. a name that is displayed in that very search result - we get: "Your search found no entities".
2) Searching for eg objects, it returns partial results (again, we know that there's more, but it's not displayed). Sorry for not being clearer, we haven't found a pattern. We just know the results are not right/complete.
Seems like the search index was broken/frozen somehow, somewhere.
Is there a way to completely reset and reset the search engine?
Thanks in advance.